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            <gco:CharacterString>Part of the European Space Agency's (ESA) Greenhouse Gases (GHG) Climate Change Initiative (CCI) project and the Climate Research Data Package Number 3 (CRDP#3), the BESD XCO2 SCIAMACHY product comprises a level 2, column-averaged dry-air mole fraction (mixing ratio) for carbon dioxide (CO2). The product has been produced using data acquired from the SCanning Imaging Absorption spectroMeter for Atmospheric CHartographY (SCIAMACHY) on board the European Space Agency's environmental research satellite ENVISAT. 

This product has been produced with the Bremen Optimal Estimation DOAS (BESD) algorithm, a full physics algorithm which uses measurements in the O2-A absorption band to retrieve scattering information of clouds and aerosols. This is the GHG CCI baseline algorithm for deriving SCIAMACHY XCO2 data:  A product has also been generated from the SCIAMACHY data using an alternative algorithm: the WFMD algorithm.   It is advised that users who aren't sure whether to use the baseline or alternative product use this product generated with the BESD baseline algorithm. For more information regarding the differences between baseline and alternative algorithms please see the GHG-CCI data products webpage in the documentation section. 

For further information on the product, including details of the BESD algorithm and the SCIAMACHY instrument, please see the associated product user guide (PUG) or the Algorithm Theoretical Basis Documents in the documentation section.

The GHG-CCI team encourage all users of their products to register with them to receive information on any updates or issues regarding the data products and to receive notification of new product releases. To register, please use the following link: http://www.iup.uni-bremen.de/sciamachy/NIR_NADIR_WFM_DOAS/CRDP_REG/</gco:CharacterString>
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         </gmd:spatialRepresentationType>
         <gmd:spatialResolution>
            <gmd:MD_Resolution>
               <gmd:distance gco:nilReason="inapplicable"/>
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         </gmd:spatialResolution>
         <gmd:language>
            <gmd:LanguageCode codeList="http://www.loc.gov/standards/iso639-2/php/code_list.php"
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         </gmd:language>
         <gmd:topicCategory>
            <gmd:MD_TopicCategoryCode>imageryBaseMapsEarthCover</gmd:MD_TopicCategoryCode>
         </gmd:topicCategory>
         <gmd:extent>
            <gmd:EX_Extent>
               <gmd:geographicElement>
                  <gmd:EX_GeographicBoundingBox>
                     <gmd:westBoundLongitude>
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                     <gmd:eastBoundLongitude>
                        <gco:Decimal>180.0</gco:Decimal>
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                     </gmd:southBoundLatitude>
                     <gmd:northBoundLatitude>
                        <gco:Decimal>90.0</gco:Decimal>
                     </gmd:northBoundLatitude>
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         <gmd:extent>
            <gmd:EX_Extent>
               <gmd:temporalElement>
                  <gmd:EX_TemporalExtent>
                     <gmd:extent>
                        <gml:TimePeriod gml:id="CEDA01">
                           <gml:beginPosition>2003-01-08T00:00:00</gml:beginPosition>
                           <gml:endPosition>2012-03-24T23:59:59</gml:endPosition>
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      <gmd:MD_Distribution>
         <gmd:distributionFormat>
            <gmd:MD_Format>
               <gmd:name>
                  <gco:CharacterString>Data are in NetCDF format</gco:CharacterString>
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               <gmd:version gco:nilReason="unknown"/>
            </gmd:MD_Format>
         </gmd:distributionFormat>
         <gmd:distributor>
            <gmd:MD_Distributor>
               <gmd:distributorContact>
                  <gmd:CI_ResponsibleParty>
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                        <gco:CharacterString>Centre for Environmental Data Analysis (CEDA)</gco:CharacterString>
                     </gmd:organisationName>
                     <gmd:positionName>
                        <gco:CharacterString>Data Center Contact</gco:CharacterString>
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                     <gmd:contactInfo>
                        <gmd:CI_Contact>
                           <gmd:phone>
                              <gmd:CI_Telephone>
                                 <gmd:voice>
                                    <gco:CharacterString>01235446432</gco:CharacterString>
                                 </gmd:voice>
                              </gmd:CI_Telephone>
                           </gmd:phone>
                           <gmd:address>
                              <gmd:CI_Address>
                                 <gmd:deliveryPoint>
                                    <gco:CharacterString>Rutherford Appleton Laboratory</gco:CharacterString>
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                                 <gmd:deliveryPoint>
                                    <gco:CharacterString>Harwell</gco:CharacterString>
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                                    <gco:CharacterString>Oxon</gco:CharacterString>
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                                    <gco:CharacterString>OX11 0QX</gco:CharacterString>
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                                 <gmd:country>
                                    <gco:CharacterString>United Kingdom</gco:CharacterString>
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                                 <gmd:electronicMailAddress>
                                    <gco:CharacterString>support@ceda.ac.uk</gco:CharacterString>
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                              </gmd:CI_Address>
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                        </gmd:CI_Contact>
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                     <gmd:role>
                        <gmd:CI_RoleCode codeList="http://standards.iso.org/ittf/PubliclyAvailableStandards/ISO_19139_Schemas/resources/codelist/gmxCodelists.xml#CI_RoleCode"
                                         codeListValue="distributor">distributor</gmd:CI_RoleCode>
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                  </gmd:CI_ResponsibleParty>
               </gmd:distributorContact>
            </gmd:MD_Distributor>
         </gmd:distributor>
         <gmd:transferOptions>
            <gmd:MD_DigitalTransferOptions>
               <gmd:onLine>
                  <gmd:CI_OnlineResource>
                     <gmd:linkage>
                        <gmd:URL>https://catalogue.ceda.ac.uk/uuid/0ecfa9cc4f81459bba840aead5eda6cd</gmd:URL>
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                     <gmd:name>
                        <gco:CharacterString>CEDA Data Catalogue Page</gco:CharacterString>
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                     <gmd:description>
                        <gco:CharacterString>Detail and access information for the resource</gco:CharacterString>
                     </gmd:description>
                     <gmd:function>
                        <gmd:CI_OnLineFunctionCode codeList="http://standards.iso.org/ittf/PubliclyAvailableStandards/ISO_19139_Schemas/resources/codelist/gmxCodelists.xml#CI_OnLineFunctionCode"
                                                   codeListValue="information">information</gmd:CI_OnLineFunctionCode>
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                  </gmd:CI_OnlineResource>
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            </gmd:MD_DigitalTransferOptions>
         </gmd:transferOptions>
         <gmd:transferOptions>
            <gmd:MD_DigitalTransferOptions>
               <gmd:onLine>
                  <gmd:CI_OnlineResource>
                     <gmd:linkage>
                        <gmd:URL>http://data.ceda.ac.uk/neodc/esacci/ghg/data/crdp_3/SCIAMACHY/BESD_CO2/v02.01.01/</gmd:URL>
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                     <gmd:name>
                        <gco:CharacterString>DOWNLOAD</gco:CharacterString>
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                     <gmd:description>
                        <gco:CharacterString>Download Data</gco:CharacterString>
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                     <gmd:function>
                        <gmd:CI_OnLineFunctionCode codeList="http://standards.iso.org/ittf/PubliclyAvailableStandards/ISO_19139_Schemas/resources/codelist/gmxCodelists.xml#CI_OnLineFunctionCode"
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                  </gmd:CI_OnlineResource>
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            </gmd:MD_DigitalTransferOptions>
         </gmd:transferOptions>
         <gmd:transferOptions>
            <gmd:MD_DigitalTransferOptions>
               <gmd:onLine>
                  <gmd:CI_OnlineResource>
                     <gmd:linkage>
                        <gmd:URL>http://www.iup.uni-bremen.de/~mreuter/besd.php</gmd:URL>
                     </gmd:linkage>
                     <gmd:name>
                        <gco:CharacterString>Bremen BESD website</gco:CharacterString>
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                     <gmd:description>
                        <gco:CharacterString>No further details.</gco:CharacterString>
                     </gmd:description>
                     <gmd:function>
                        <gmd:CI_OnLineFunctionCode codeList="http://standards.iso.org/ittf/PubliclyAvailableStandards/ISO_19139_Schemas/resources/Codelist/gmxCodelists.xml#CI_OnLineFunctionCode"
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            </gmd:MD_DigitalTransferOptions>
         </gmd:transferOptions>
         <gmd:transferOptions>
            <gmd:MD_DigitalTransferOptions>
               <gmd:onLine>
                  <gmd:CI_OnlineResource>
                     <gmd:linkage>
                        <gmd:URL>http://www.esa-ghg-cci.org/sites/default/files/documents/public/documents/GHG-CCI_DATA.html</gmd:URL>
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                     <gmd:name>
                        <gco:CharacterString>GHG-CCI Data Products webpage</gco:CharacterString>
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                     <gmd:description>
                        <gco:CharacterString>No further details.</gco:CharacterString>
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                     <gmd:function>
                        <gmd:CI_OnLineFunctionCode codeList="http://standards.iso.org/ittf/PubliclyAvailableStandards/ISO_19139_Schemas/resources/Codelist/gmxCodelists.xml#CI_OnLineFunctionCode"
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         </gmd:transferOptions>
         <gmd:transferOptions>
            <gmd:MD_DigitalTransferOptions>
               <gmd:onLine>
                  <gmd:CI_OnlineResource>
                     <gmd:linkage>
                        <gmd:URL>http://onlinelibrary.wiley.com/doi/10.1029/2010JD015047/abstract</gmd:URL>
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                        <gco:CharacterString>No further details.</gco:CharacterString>
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                     <gmd:function>
                        <gmd:CI_OnLineFunctionCode codeList="http://standards.iso.org/ittf/PubliclyAvailableStandards/ISO_19139_Schemas/resources/Codelist/gmxCodelists.xml#CI_OnLineFunctionCode"
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            </gmd:MD_DigitalTransferOptions>
         </gmd:transferOptions>
         <gmd:transferOptions>
            <gmd:MD_DigitalTransferOptions>
               <gmd:onLine>
                  <gmd:CI_OnlineResource>
                     <gmd:linkage>
                        <gmd:URL>http://www.esa-ghg-cci.org/webfm_send/276</gmd:URL>
                     </gmd:linkage>
                     <gmd:name>
                        <gco:CharacterString>System Verification Report (SVR) for BESD v02.01.01</gco:CharacterString>
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                     <gmd:description>
                        <gco:CharacterString>No further details.</gco:CharacterString>
                     </gmd:description>
                     <gmd:function>
                        <gmd:CI_OnLineFunctionCode codeList="http://standards.iso.org/ittf/PubliclyAvailableStandards/ISO_19139_Schemas/resources/Codelist/gmxCodelists.xml#CI_OnLineFunctionCode"
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            </gmd:MD_DigitalTransferOptions>
         </gmd:transferOptions>
         <gmd:transferOptions>
            <gmd:MD_DigitalTransferOptions>
               <gmd:onLine>
                  <gmd:CI_OnlineResource>
                     <gmd:linkage>
                        <gmd:URL>http://www.esa-ghg-cci.org/webfm_send/284</gmd:URL>
                     </gmd:linkage>
                     <gmd:name>
                        <gco:CharacterString>Comprehensive Error Characterisation Report: BESD full-physics retrieval algorithm for XCO2</gco:CharacterString>
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                        <gco:CharacterString>No further details.</gco:CharacterString>
                     </gmd:description>
                     <gmd:function>
                        <gmd:CI_OnLineFunctionCode codeList="http://standards.iso.org/ittf/PubliclyAvailableStandards/ISO_19139_Schemas/resources/Codelist/gmxCodelists.xml#CI_OnLineFunctionCode"
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                  </gmd:CI_OnlineResource>
               </gmd:onLine>
            </gmd:MD_DigitalTransferOptions>
         </gmd:transferOptions>
         <gmd:transferOptions>
            <gmd:MD_DigitalTransferOptions>
               <gmd:onLine>
                  <gmd:CI_OnlineResource>
                     <gmd:linkage>
                        <gmd:URL>http://www.esa-ghg-cci.org/?q=webfm_send/300</gmd:URL>
                     </gmd:linkage>
                     <gmd:name>
                        <gco:CharacterString>Product Validation and Intercomparison Report (PVIRv4)</gco:CharacterString>
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                        <gco:CharacterString>No further details.</gco:CharacterString>
                     </gmd:description>
                     <gmd:function>
                        <gmd:CI_OnLineFunctionCode codeList="http://standards.iso.org/ittf/PubliclyAvailableStandards/ISO_19139_Schemas/resources/Codelist/gmxCodelists.xml#CI_OnLineFunctionCode"
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                  </gmd:CI_OnlineResource>
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            </gmd:MD_DigitalTransferOptions>
         </gmd:transferOptions>
         <gmd:transferOptions>
            <gmd:MD_DigitalTransferOptions>
               <gmd:onLine>
                  <gmd:CI_OnlineResource>
                     <gmd:linkage>
                        <gmd:URL>http://www.esa-ghg-cci.org/index.php?q=webfm_send/160</gmd:URL>
                     </gmd:linkage>
                     <gmd:name>
                        <gco:CharacterString>Product Specification Document Version 3 (PSDv3)</gco:CharacterString>
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                        <gco:CharacterString>No further details.</gco:CharacterString>
                     </gmd:description>
                     <gmd:function>
                        <gmd:CI_OnLineFunctionCode codeList="http://standards.iso.org/ittf/PubliclyAvailableStandards/ISO_19139_Schemas/resources/Codelist/gmxCodelists.xml#CI_OnLineFunctionCode"
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         </gmd:transferOptions>
         <gmd:transferOptions>
            <gmd:MD_DigitalTransferOptions>
               <gmd:onLine>
                  <gmd:CI_OnlineResource>
                     <gmd:linkage>
                        <gmd:URL>http://www.esa-ghg-cci.org/webfm_send/273</gmd:URL>
                     </gmd:linkage>
                     <gmd:name>
                        <gco:CharacterString>Algorithm Theoretical Basis Document Version 4 (ATBDv4) - The Bremen Optimal Estimation DOAS (BESD) algorithm for the retrieval of XCO2</gco:CharacterString>
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                     <gmd:description>
                        <gco:CharacterString>No further details.</gco:CharacterString>
                     </gmd:description>
                     <gmd:function>
                        <gmd:CI_OnLineFunctionCode codeList="http://standards.iso.org/ittf/PubliclyAvailableStandards/ISO_19139_Schemas/resources/Codelist/gmxCodelists.xml#CI_OnLineFunctionCode"
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                  </gmd:CI_OnlineResource>
               </gmd:onLine>
            </gmd:MD_DigitalTransferOptions>
         </gmd:transferOptions>
         <gmd:transferOptions>
            <gmd:MD_DigitalTransferOptions>
               <gmd:onLine>
                  <gmd:CI_OnlineResource>
                     <gmd:linkage>
                        <gmd:URL>http://www.esa-ghg-cci.org/webfm_send/274</gmd:URL>
                     </gmd:linkage>
                     <gmd:name>
                        <gco:CharacterString>Product User Guide</gco:CharacterString>
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                     <gmd:description>
                        <gco:CharacterString>No further details.</gco:CharacterString>
                     </gmd:description>
                     <gmd:function>
                        <gmd:CI_OnLineFunctionCode codeList="http://standards.iso.org/ittf/PubliclyAvailableStandards/ISO_19139_Schemas/resources/Codelist/gmxCodelists.xml#CI_OnLineFunctionCode"
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                  </gmd:CI_OnlineResource>
               </gmd:onLine>
            </gmd:MD_DigitalTransferOptions>
         </gmd:transferOptions>
         <gmd:transferOptions>
            <gmd:MD_DigitalTransferOptions>
               <gmd:onLine>
                  <gmd:CI_OnlineResource>
                     <gmd:linkage>
                        <gmd:URL>https://climate.esa.int/projects/ghgs/</gmd:URL>
                     </gmd:linkage>
                     <gmd:name>
                        <gco:CharacterString>ESA CCI Greenhouse Gases project website</gco:CharacterString>
                     </gmd:name>
                     <gmd:description>
                        <gco:CharacterString>No further details.</gco:CharacterString>
                     </gmd:description>
                     <gmd:function>
                        <gmd:CI_OnLineFunctionCode codeList="http://standards.iso.org/ittf/PubliclyAvailableStandards/ISO_19139_Schemas/resources/Codelist/gmxCodelists.xml#CI_OnLineFunctionCode"
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                     </gmd:function>
                  </gmd:CI_OnlineResource>
               </gmd:onLine>
            </gmd:MD_DigitalTransferOptions>
         </gmd:transferOptions>
         <gmd:transferOptions>
            <gmd:MD_DigitalTransferOptions>
               <gmd:onLine>
                  <gmd:CI_OnlineResource>
                     <gmd:linkage>
                        <gmd:URL>http://data.ceda.ac.uk/neodc/esacci/ghg/metadata/sample_images/ESACCI-GHG-L2-CO2-SCIAMACHY-BESD-20100401-fv1.png</gmd:URL>
                     </gmd:linkage>
                     <gmd:name>
                        <gco:CharacterString>Sample Image</gco:CharacterString>
                     </gmd:name>
                     <gmd:description>
                        <gco:CharacterString>No further details.</gco:CharacterString>
                     </gmd:description>
                     <gmd:function>
                        <gmd:CI_OnLineFunctionCode codeList="http://standards.iso.org/ittf/PubliclyAvailableStandards/ISO_19139_Schemas/resources/Codelist/gmxCodelists.xml#CI_OnLineFunctionCode"
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                  </gmd:CI_OnlineResource>
               </gmd:onLine>
            </gmd:MD_DigitalTransferOptions>
         </gmd:transferOptions>
      </gmd:MD_Distribution>
  </gmd:distributionInfo>
  <gmd:dataQualityInfo>
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         <gmd:scope>
            <gmd:DQ_Scope>
               <gmd:level>
                  <gmd:MD_ScopeCode codeList="http://standards.iso.org/ittf/PubliclyAvailableStandards/ISO_19139_Schemas/resources/codelist/gmxCodelists.xml#MD_ScopeCode"
                                    codeListValue="dataset">dataset</gmd:MD_ScopeCode>
               </gmd:level>
            </gmd:DQ_Scope>
         </gmd:scope>
         <gmd:report>
            <gmd:DQ_DomainConsistency>
               <gmd:result>
                  <gmd:DQ_ConformanceResult>
                     <gmd:specification>
                        <gmd:CI_Citation>
                           <gmd:title>
                              <gco:CharacterString>Commission Regulation (EU) No 1089/2010 of 23 November 2010 implementing Directive 2007/2/EC of the European Parliament and of the Council as regards interoperability of spatial data sets and services</gco:CharacterString>
                           </gmd:title>
                           <gmd:date>
                              <gmd:CI_Date>
                                 <gmd:date>
                                    <gco:Date>2010-12-08</gco:Date>
                                 </gmd:date>
                                 <gmd:dateType>
                                    <gmd:CI_DateTypeCode codeList="http://standards.iso.org/ittf/PubliclyAvailableStandards/ISO_19139_Schemas/resources/codelist/gmxCodelists.xml#CI_DateTypeCode"
                                                         codeListValue="publication"/>
                                 </gmd:dateType>
                              </gmd:CI_Date>
                           </gmd:date>
                        </gmd:CI_Citation>
                     </gmd:specification>
                     <gmd:explanation gco:nilReason="inapplicable"/>
                     <gmd:pass gco:nilReason="unknown"/>
                  </gmd:DQ_ConformanceResult>
               </gmd:result>
            </gmd:DQ_DomainConsistency>
         </gmd:report>
         <gmd:lineage>
            <gmd:LI_Lineage>
               <gmd:statement>
                  <gco:CharacterString>Data were processed by the ESA CCI GHG project team and supplied to CEDA as part of the ESA CCI Open Data Portal Project</gco:CharacterString>
               </gmd:statement>
            </gmd:LI_Lineage>
         </gmd:lineage>
      </gmd:DQ_DataQuality>
  </gmd:dataQualityInfo>
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