PDS_VERSION_ID        = PDS3
RECORD_TYPE           = STREAM
OBJECT                = TEXT
  PUBLICATION_DATE    = 2013-02-27
  NOTE                = "Description of the ChemCam BROWSE directory."
END_OBJECT            = TEXT
END
   
                                BROWINFO.TXT
                             February 27, 2013

==============================================================================
INTRODUCTION
==============================================================================

This file describes the contents of the BROWSE partition of the 
Chemistry & Camera(ChemCam) submission to NASA's Planetary Data System(PDS).
The data included are derived from the operation of the ChemCam spectrometers
and are meant for use as an initial reference.

The complete ChemCam spectrum consists of 6144 channels over three spectral
ranges: UV, VIS, VNIR.  The LIBS QuickLook 1 shows the wavelength in nm on 
the x-axis and a relative intensity on the y-axis (normalized to 1 in each
spectral range).  To guide the eye, a layer of pre-positioned lines is 
superimposed on the spectra, but there is not necessarily a match between
lines and elements. Pre-positioned lines were chosen for their diagnostic
position only.

Note that weaker lines does not necessarily correspond to lower abundances,
and relative intensities depend also on the laser-target coupling efficiency,
on the line emission properties, on self-absorption in the plasma, and on the
distance.  The captions give information on the low-level processing applied
to the spectra, a few housekeeping information, and the total counts in each
spectral range.  While the LIBS QuickLook 1(LIBS1) shows the average spectrum,
the LIBS QuickLook 2(LIBS2) shows a spectrogram, where each individual 
spectrum represented as a line with its intensity color coded (and the sum 
spectrum is shown at the top).

The directory is organized into Sol's.
All of the files are described by detached PDS labels.

The file naming convention is:

  QCHEMCAM_nnnnn_type_sclk.ext

where
    nnnnn is the sol number
             
    type is the browse type
          LIBS1 - Average of DATA 
          LIBS2 - stack plot 
          RMI - RMI

    sclk is the space craft clock time

    ext  is the file extension (JPG, LBL)