PDS_VERSION_ID      = PDS3                                                    
RECORD_TYPE         = STREAM                                                  
                                                                              
OBJECT     = TEXT                                                             
  PUBLICATION_DATE = 2013-10-04                                               
  NOTE             = "Description of the LABEL directory                      
                      contents for MESSENGER archive volumes"                 
END_OBJECT = TEXT                                                             
END                                                                           
                                                                              
The LABEL directory contains the following format files. These format files   
describe the table and data objects which store the GRS EDR data.             
                                                                              
GRS_FPGA.FMT: Format of GRS FPGA/ADC Diagnostic data, as reported by the      
GAMMA RAY SPECTROMETER (GRS).                                                 
                                                                              
GRS_HPGE_AC.FMT: Format of GRS HPGE Anti-Coincident Spectra data, as          
reported by the GAMMA RAY SPECTROMETER (GRS).                                 
                                                                              
GRS_HPGE_RAW.FMT: Format of GRS HPGE Raw Spectra data, as reported by the     
GAMMA RAY SPECTROMETER (GRS).                                                 
                                                                              
GRS_MICRO.FMT: Format of GRS Microphonics data, as reported by the GAMMA RAY  
SPECTROMETER (GRS).                                                           

GRS_SHIELD.FMT: Format of the Shield Spectra for data taken before the FSW 
update on September 17, 2010, as reported by the GAMMA RAY SPECTROMETER 
(GRS).                 
                                                                              
GRS_SHIELD_2.FMT: Format of the Shield Spectra for data taken after the FSW 
update on September 17, 2010, as reported by the GAMMA RAY SPECTROMETER 
(GRS).                                                       
                                                                              
GRS_SCR.FMT: Format of the Shield Count Rate data, as reported by the GAMMA 
RAY SPECTROMETER (GRS).                                                       

GRS_STATUS.FMT: Format of GRS Status data, as reported by the GAMMA RAY       
SPECTROMETER (GRS).                                                           
                                                                              
GRS_SWC.FMT: Format of GRS Software Rate Counters data, as reported by the    
GAMMA RAY SPECTROMETER (GRS).                                                 
                                                                              
GRS_CMDECHO.FMT: Format of GRS Command Echo data, as reported by the GAMMA    
RAY SPECTROMETER (GRS).