If an image has been made from an event file, and one or more sources have been detected when running DETECT, then the command extract/detect/plot will make a color-color diagram. This is useful for identifying very soft or very hard sources in the field. The default channel boundaries can be changed using the /C1, /C2, /C3, /C4 qualifiers. An output QDP format filename containing the results is written with a default of the eventfile.col, where eventfile is the input event filename. A new name is given with the qualifier filecolor=. Note that when /detect is given, the extract command will not pick up the default region file.