X-ray Spectrometer (XRS) Calibrated Data
MESSENGER Mission to Mercury

This bundle contains the following collections:

data_cdr - calibrated data products
document - the XRS CDR/RDR Software Interface Specification and other relevant documents
miscellaneous - the PDS3 index table for this archive

This PDS4 bundle has been migrated from a PDS3 data volume. For details, see the document
geo_notes_and_errata.pdf in the document collection.

Each document and data product in this bundle is described by a PDS4 label in a separate file with 
the same name but with the extension XML. PDS4 labels are XML (eXtended Markup Language) files that 
conform to the PDS4 Information Model XML schema at https://pds.nasa.gov/pds4/schema/released/. 
They are best viewed in an XML-aware text editor, and may be used by software that can manipulate 
XML documents.


The MESSENGER XRS calibrated product collection consists of calibrated XRS spectral data. The
supernova remnant X-ray source Cassiopeia-A (Cas-A) was periodically used for in-flight calibration
due to its relatively high intensity in the XRS energy range. A description of this product type is
given in the table below. Code refers to the product type abbreviation used in the file name.


Code     Product Type        Description                                             Storage Format

CDR      Spectra             This table contains calibrated X-ray spectra and        Binary Table  
                             associated instrument parameters such as detector                     
                             energy calibration, engineering data conversions, and                 
                             spatial data which will be necessary to convert raw                   
                             XRS counts to planetary surface compositions.                         

XRS Calibrated products have the following file names:
xrscdryyyyddd.dat
where:
yyyy = 4-digit year corresponding to the Mercury Elapsed Time (MET) for each product
ddd  = 3-digit day of year corresponding to the MET for each product in the EDR

This bundle was created and archived by the Geosciences Node of the Planetary Data System. 
Questions about this bundle may be directed to geosci@wunder.wustl.edu.