PDS_VERSION_ID        = PDS3
RECORD_TYPE           = STREAM

OBJECT                = TEXT
  PUBLICATION_DATE    = 2013-03-20
  NOTE                = "Description of contents of CALIB directory"
END_OBJECT            = TEXT
END

The CALIB directory contains calibration data generated pre-flight using 
the APXS Proto-Flight Model (PFM), the flight model that is now on Mars.

                         
Calibration data files are named according to the scheme

    APXS_PFM2008_productype_standard.ext
    
where

    productype = SPECTRUM or CONCENTRATIONS
    standard = the calibration standard, e.g. AGV2 or BEN
    ext = CSV for the data file, LBL for the PDS label
    
See J. L. Campbell et al., Calibration of Mars Science Laboratory Alpha 
Particle X-ray Spectrometer, Space Sci. Rev. doi:10.1007/s11214-012-9873-5, 
2012, for details of the APXS calibration procedures.