The task starts up by displaying a small progress-dialog box whilst it is doing some initialisation work. If the parameter imageset was omitted on the command-line, a menu will appear prompting the user to select an image-file, either from a list of the last ten image-files assessed, or from a directory. Various checks are carried out on the selected file to ascertain that it contains a modulo-8 corrected, distortion-corrected and rotated image. If a check fails a warning message is displayed and the user is prompted to enter another file name. The selected image is then displayed using ds9 and shortly afterwards the main window appears (see Figure 1).
