When converting count rate to flux for CCD data, X1D and X2D have been changed to multiply by the value of the primary header keyword ATODGAIN.
X2D now takes into account that the "plate scale" may differ between AXIS1 and AXIS2 in the case of binned data. The plate scale is needed for converting aperture offsets from arcseconds to pixels.
Three new keywords have been added to the headers and are populated by X2D. These keywords are needed to define fully the intensity units for targets that are continuum vs. emission line sources, and whether or not they are spatially resolved. The keywords are CONT2EML, SCALE_A1, and OMEGAPIX.
When doing geometric correction for imaging mode (GEOCORR), X2D no longer attempts to conserve flux. This is now consistent with spectroscopic mode. In addition, flat fields are made with the assumption that flux conservation will not be included during geometric correction.
