This function may be performed alone by calling the script with entrystage and finalstage=`makenonvig'. It is performed using the task eexpmap with –withvignetting set to `no'. As well as acting as general image templates, the exposure maps are also used as background templates (see next subsection). A great part of the background is non- or negligably-vignetted, hence the need for non-vignetted exposure maps.
Because this is a quite lengthy procedure, the function checks to see if all required non-vignetted maps are already present: only if this is not the case are the missing maps generated. If you want to force eimsimprep to make them again you will have to delete the files yourself beforehand.