HDUVERS = 1.2.0

The following changes were made mainly to allow for more sophisticated analysis of grating spectra. The CHANNEL number can be either 2-byte or 4-byte INTEGER. The AREASCAL and BACKSCAL keywords have been expanded to vectors with a different value allowed for each channel. In this case, they appear as additional columns in the Type-I file and as a vector element in a column in the Type-II file.