The Science Image file contains the WFPC-II image data with the readout from each CCD detector in each group. Hence from 1 to 4 groups may be present. The header should conform to the standard WFPC-II header format. Keywords in the header are used to select the various processing steps and to specify the names of the necessary reference files. Science Image files are identified by the extensions ``.D0H'' and ``.D0D''.
