PDS_VERSION_ID         =  PDS3                                                
                                                                              
LABEL_REVISION_NOTE    = "                                                    
        2018-09-01: N. Ligier, initial draft, v1.0                            
        2019-04-01: N. Ligier, revised draft, v1.0                            
        2020-06-01: N. Ligier, updated version, v1.0"                         
                                                                              
RECORD_TYPE            =  STREAM                                              
                                                                              
PRODUCT_ID             = "INFO_DATA_WHT_ISIS"                                 
DATA_SET_ID            = "EAR-C-MULTI-3-67P-SPEC-V1.0"                        
PRODUCT_CREATION_TIME  =  2020-06-01T00:00:00                                 
                                                                              
OBJECT                 = TEXT                                                 
  INTERCHANGE_FORMAT       =  ASCII                                           
  PUBLICATION_DATE         =  2020-06-01                                      
  NOTE                     = "The data reduction was not done by the PIs of   
        the observations but by Dr. Nicolas LIGIER. Only bias subtraction and 
        flat division were performed, hence wavelength calibration should be  
        performed by yourself. Details about the files used for the bias      
        subtraction and the flat normalisation are given in TXT files in every
        last sub-folders of the CALIB directory."                             
END_OBJECT             = TEXT                                                 
                                                                              
END                                                                           
                                                                              
                                                                              
==============================================================================
ADDITIONAL INFORMATION                                                        
==============================================================================
                                                                              
Each science file contained in the DATA directory were produced thanks to:    
   - raw data contained in the level 2 dataset (EAR-C-MULTI-2-67P-SPEC-V1.0)  
   - masterbias subtraction                                                   
   - masterflat division                                                      
                                                                              
Here is the formula used to get every file in the DATA folder of this dataset:
       reduced file = (raw file - masterbias) / "normalized" masterflat       
Beforehand, each masterflat are normalized compared to the time exposure of   
the raw file, meaning that every pixel of the masterflat file is multiplied by
the following ratio R = raw file exposure time / masterflat exposure time.