PDS_VERSION_ID        = PDS3                                                  
RECORD_TYPE           = STREAM                                                
OBJECT                = TEXT                                                  
  PUBLICATION_DATE    = 2015-02-12                                            
  NOTE                = "Description of the CALIB directory contents."        
END_OBJECT            = TEXT                                                  
END                                                                           
                                                                              
The flat fields and stray light patterns in the "FLAT_FIELDS" and             
"STRAY_LIGHT_PATTERNS" directories can be used to radiometrically             
calibrate Dawn Framing Camera 2 images. The calibrated images are             
to first order corrected for in-field stray light. The full calibration       
process is described in Schroeder et al. (2013) "In-flight calibration        
of the Dawn Framing Camera", Icarus 226, 1304-1317 and                        
Schroeder et al. (2014) "In-flight calibration of the Dawn Framing            
Camera II: Flat fields and stray light correction", Icarus 234, 99-108.       
Note that there is no stray light pattern for filter F1 (clear),              
because images acquired through this filter are free of this type             
of stray light.  As described in Schroeder et al. (2014), the filter 3 flat   
field varies with the direction of motion of the filter wheel (increasing     
or decreasing). Both versions of the F3 flat field image are included here.