Version 1.0 initial release of data 
Version 1.5 12/03/2001. Changed computation of error bars from using a maximum error to using real tracking error
Version 2.0 03/05/2002. Changed calibration of 605 nm channel for flights starting with CIR10. Effect is about 0.01 in AOD.
                        Also reduced error bars to 0.5*(pre-post mission cal).
Version 3.0 11/01/2002. Changed water vapor spectroscopy to LBLRTM 6.01 (HITRAN 2000, release 11).
                        Released H2O profiles including errorbars and in-situ density.         
                        Applied diffuse light correction
                        Added error bars to extinction profiles.