header:
  dimensions:
    num_records: 24
  global_attributes:
    acknowledgement: GRACE-FO is a joint mission of the US National Aeronautics and Space Administration and the German Research Center for Geosciences.  Use the digital object identifier provided in the id attribute when citing this data.  See https://podaac.jpl.nasa.gov/CitingPODAAC
    conventions: CF-1.6, ACDD-1.3, ISO 8601
    creator_email: gracefo@podaac.jpl.nasa.gov
    creator_institution: NASA/JPL
    creator_name: GRACE Follow-On Science Data System
    creator_type: group
    creator_url: http://gracefo.jpl.nasa.gov
    date_created: 2026-07-15T02:56:07Z
    date_issued: 2026-07-23T13:39:45Z
    history:
      - "INPUT FILE NAME               : MAS1A<-MAS1A_2026-06-29_D_04.dat"
      - "INPUT FILE CREATION TIME (UTC): MAS1A<-2026-07-14 22:57:09 by operator"
      - "INPUT FILE SOFTWARE VERSION   : MAS1A<-V04.10.2020-11-09-77-gc5e91-dirty"
      - "INPUT FILE BUILDTIME TAG      : MAS1A<-06-21_17:10:48_UTC"
      - "INPUT FILE NAME               : CLK1B<-CLK1B_2026-06-29_D_04.dat"
      - "INPUT FILE CREATION TIME (UTC): CLK1B<-2026-07-15 02:52:00 by operator"
      - "INPUT FILE SOFTWARE VERSION   : CLK1B<-V04.10.2020-11-09-77-gc5e91-dirty"
      - "INPUT FILE BUILDTIME TAG      : CLK1B<-06-21_17:10:47_UTC"
      - "INPUT FILE NAME               : TIM1B<-TIM1B_2026-06-29_D_04.dat"
      - "INPUT FILE CREATION TIME (UTC): TIM1B<-2026-06-30 05:04:11 by operator"
      - "INPUT FILE SOFTWARE VERSION   : TIM1B<-V04.10.2020-11-09-77-gc5e91-dirty"
      - "INPUT FILE BUILDTIME TAG      : TIM1B<-06-21_17:10:44_UTC"
    id: 10.5067/GFJPL-L1B04
    institution: NASA/JPL
    instrument: Satellite and tank gas mass
    instrument_vocabulary: NASA Global Change Master Directory instrument keywords
    keywords: GRACE-FO, Satellite and tank gas mass
    keywords_vocabulary: NASA Global Change Master Directory (GCMD) Science Keywords
    license: https://science.nasa.gov/earth-science/earth-science-data/data-information-policy
    naming_authority: org.doi.dx
    platform: GRACE D
    platform_vocabulary: NASA Global Change Master Directory platform keywords
    processing_level: 1B
    product_version: 04
    program: NASA Earth Systematic Missions Program
    project: NASA Gravity Recovery And Climate Experiment Follow-On (GRACE-FO)
    publisher_email: podaac@jpl.nasa.gov
    publisher_institution: NASA/JPL
    publisher_name: Physical Oceanography Distributed Active Archive Center
    publisher_type: group
    publisher_url: http://podaac.jpl.nasa.gov
    references: https://podaac.jpl.nasa.gov/gravity/gracefo-documentation
    source: Satellite and tank gas mass data from GRACE D
    summary: Satellite and tank gas masses over time based on thruster usage and tank observations
    time_coverage_start: 2026-06-29T00:59:59.97
    time_coverage_stop: 2026-06-29T23:59:59.97
    title: GRACE-FO Level-1B Mass Data
  non-standard_attributes:
    epoch_time: 2000-01-01T12:00:00.00
    software_build_time: 2023-06-21T17:10:46 UTC
    software_version: V04.10.2020-11-09-77-gc5e91-dirty
    start_time_epoch_secs: 835966799.974486
    stop_time_epoch_secs: 836049599.972983
  variables:
    - time_intg:
        comment: 1st column
        coverage_content_type: referenceInformation
        long_name: Seconds past 12:00:00 noon of January 1, 2000 in GPS time
        units: seconds
    - time_frac:
        comment: 2nd column
        coverage_content_type: referenceInformation
        long_name: Fractional portion of time tag
        units: microseconds
        valid_range: 0, 999999
    - time_ref:
        comment: 3rd column
        coverage_content_type: referenceInformation
        long_name: Time reference frame
        units: char
        value_meanings:
          - R = Receiver, OBC, or LRI time
          - G = GPS time
    - GRACEFO_id:
        comment: 4th column
        coverage_content_type: referenceInformation
        long_name: GRACE-FO satellite identifier
        units: char
        valid_range: C,D
        value_meanings:
          - C = GRACE-FO 1 (GRACE C)
          - D = GRACE-FO 2 (GRACE D)
    - qualflg:
        comment: 5th column
        coverage_content_type: qualityInformation
        flag_masks: 1b, 2b, 4b, 8b, 16b, 32b, 64b, 128b
        flag_meanings:
          - bits 0-5 = Not defined
          - bit 6 = No OBC-to-Receiver Time mapping
          - bit 7 = No clock correction available
        long_name: Quality flags, bit 0 is rightmost
    - prod_flag:
        comment: 6th column
        coverage_content_type: referenceInformation
        flag_masks: 1b, 2b, 4b, 8b, 16b, 32b, 64b
        flag_meanings:
          - bit 0 = mass_thr
          - bit 1 = mass_thr_err
          - bit 2 = mass_tnk
          - bit 3 = mass_tnk_err
          - bit 4 = gas_mass_thr1
          - bit 5 = gas_mass_thr2
          - bit 6 = gas_mass_tnk1
          - bit 7 = gas_mass_tnk2
        long_name: Product flag, if bit set to 1, value is present in record, bit 0 is rightmost
    - mass_thr:
        comment: next column, if prod_flag bit set
        coverage_content_type: modelResult
        long_name: Spacecraft mass based on thruster usage
        units: kg
    - mass_thr_err:
        comment: next column, if prod_flag bit set
        coverage_content_type: qualityInformation
        long_name: Error in mass_thr (from 'error bit 0')
    - mass_tnk:
        comment: next column, if prod_flag bit set
        coverage_content_type: physicalMeasurement
        long_name: Spacecraft mass from tank observations
        units: kg
    - mass_tnk_err:
        comment: next column, if prod_flag bit set
        coverage_content_type: qualityInformation
        long_name: Error in mass_tnk (from 'error bit 2')
    - gas_mass_thr1:
        comment: next column, if prod_flag bit set
        coverage_content_type: modelResult
        long_name: Mass of gas in tank 1 based on thruster usage
        units: kg
    - gas_mass_thr2:
        comment: next column, if prod_flag bit set
        coverage_content_type: modelResult
        long_name: Mass of gas in tank 2 based on thruster usage
        units: kg
    - gas_mass_tnk1:
        comment: next column, if prod_flag bit set
        coverage_content_type: modelResult
        long_name: Mass of gas in tank 1 based on tank and thruster observations
        units: kg
    - gas_mass_tnk2:
        comment: next column, if prod_flag bit set
        coverage_content_type: modelResult
        long_name: Mass of gas in tank 2 based on tank and thruster observations
        units: kg
# End of YAML header
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835970399 974421 G D  00000000 11000000 12.75623702195698 13.26008845475025
835973999 974355 G D  00000000 11000000 12.75623702195698 13.26008845475025
835977599 974290 G D  00000000 11000000 12.75623702195697 13.26008845475025
835981199 974225 G D  00000000 11000000 12.75623702195697 13.26008845475026
835984799 974159 G D  00000000 11000000 12.75623702195697 13.26008845475025
835988399 974094 G D  00000000 11000000 12.75623702195697 13.26008845475026
835991999 974029 G D  00000000 11000000 12.75623702195698 13.26008845475027
835995599 973963 G D  00000000 11000000 12.75618440498095 13.26005789083575
835999199 973898 G D  00000000 11000000 12.75618440498095 13.26005789083574
836002799 973833 G D  00000000 11000000 12.75618440498096 13.26005789083575
836006399 973767 G D  00000000 11000000 12.75613930471478 13.26003169319425
836009999 973702 G D  00000000 11000000 12.75613930471478 13.26003169319425
836013599 973637 G D  00000000 11000000 12.75613930471478 13.26003169319425
836017199 973571 G D  00000000 11000000 12.75613930471479 13.26003169319426
836020799 973506 G D  00000000 11000000 12.75613930471479 13.26003169319426
836024399 973441 G D  00000000 11000000 12.75613930471479 13.26003169319427
836027999 973375 G D  00000000 11000000 12.756101721158 13.26000986182556
836031599 973310 G D  00000000 11000000 12.75610172115799 13.26000986182555
836035199 973245 G D  00000000 11000000 12.756101721158 13.26000986182556
836038799 973179 G D  00000000 11000000 12.75604910417739 13.25997929790885
836042399 973114 G D  00000000 11000000 12.75604910417739 13.25997929790885
836045999 973049 G D  00000000 11000000 12.75604910417739 13.25997929790886
836049599 972983 G D  00000000 11000000 12.75600400390736 13.2599531002655
