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_IRTF_CSHELL"                              
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 PI of the
        observations but by Dr. Nicolas LIGIER. For acquisition data, i.e.    
        files in 'ACQ' sub-folders, only dark subtraction was performed, while
        dark subtraction and flat division were performed for all the         
        spectroscopic data (files in 'ETH' or 'H2O' sub-folders). Complete    
        information about the calibration files used for the bias subtraction 
        and the flat division are given in TXT files for every night of       
        observations inside the DATA 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)  
   - masterdark subtraction (when biases available)                           
   - masterflat division                                                      
                                                                              
                                                                              
Here is the formula used to get every acquisition file ('ACQ' sub-folders) in 
the DATA folder of this dataset:                                              
       reduced acquisition file = raw file - 'normalized' masterdark          
                                                                              
Then, here is the formula used to get every spectroscopic file ('H2O' and     
'ETH' sub-folders) in the DATA folder of this dataset:                        
      reduced data = (raw data - masterdark)/(masterflat - masterdark)        
                                                                              
Please note that in the case of the data reduction of these IRTF CSHELL data, 
we concluded after multiple tests that most of the normalization of the       
master-files based on the time exposure produces unexpected artifacts.        
Consequently, if any, some unusual normalization may have been performed for  
these data. Everything is explained in the TXT file provided for every night  
of observations.                                                              
                                                                              
For further information please contact the PIs of the data, Dr. Lucas PAGANINI