PDS_VERSION_ID        = PDS3                                                  
RECORD_TYPE           = STREAM                                                
DATA_SET_ID           = "RO-CAL/J/M-ALICE-3-MARS-V1.0"                        
PRODUCT_CREATION_TIME = 2007-04-09T00:00:00                                   
PRODUCT_ID            = "ALICE_L3_TO_RAYLEIGHS"                               
OBJECT                = TEXT                                                  
  INTERCHANGE_FORMAT    = ASCII                                               
  PUBLICATION_DATE      = 2007-04-09                                          
  NOTE                  = "Description of the how to convert the Science level
    (CODMAC level 3) data from the default flux units (photons cm**-2 s**-1)  
    to units of Rayleighs per Angstrom."                                      
END_OBJECT            = TEXT                                                  
                                                                              
END                                                                           
                                                                              
The primary data extension of CODMAC level 3 Rosetta Alice data               
(science-level) is in flux units (photons cm**-2 s**-1). To convert           
this extension to Rayleighs per Angstrom (10**6/4 Pi photons cm**-            
s**-1 sr**-1 A**-1) it is necessary to multiply each pixel by 4 Pi            
10**6. Next, the pixels must be divided by the absolute value of the            
instrument dispersion (-1.73435 angstroms/pixel). Finally the pixels in       
each row of the detector must be divided by the solid angle subtended         
by the source. In the case of a uniformly illuminated slit, this solid        
angle is that subtended by that detector row. Rows subtend 0.308              
degrees in the spatial direction and between 0.05 and 0.10 degrees in         
the spectra dimension. The following list gives the solid angle (in           
units of steradians) subtended by each row as a function of row number        
(zero-indexed):                                                               
                                                                              
Row Number Solid Angle                                                        
       0          NaN                                                         
       1          NaN                                                         
       2          NaN                                                         
       3          NaN                                                         
       4          NaN                                                         
       5  9.38222e-06                                                         
       6  9.38222e-06                                                         
       7  9.38222e-06                                                         
       8  9.38222e-06                                                         
       9  9.38222e-06                                                         
      10  9.38222e-06                                                         
      11  9.38222e-06                                                         
      12  7.03666e-06                                                         
      13  4.69111e-06                                                         
      14  4.69111e-06                                                         
      15  4.69111e-06                                                         
      16  4.69111e-06                                                         
      17  4.69111e-06                                                         
      18  4.69111e-06                                                         
      19  9.38222e-06                                                         
      20  9.38222e-06                                                         
      21  9.38222e-06                                                         
      22  9.38222e-06                                                         
      23  9.38222e-06                                                         
      24          NaN                                                         
      25          NaN                                                         
      26          NaN                                                         
      27          NaN                                                         
      28          NaN                                                         
      29          NaN                                                         
      30          NaN                                                         
      31          NaN