The program is interactive and prompts for all information.
Any region is valid, including positive and negative coordinates, and spanning of unit cells.
It prompts for the names of the input and output map files, and the type of output file desired. The standard deviation for the output map is then given to aid in contour level selection later in the graphics programs. The user is then asked if a skeleton should be generated, and if so, for the base and step level for skeletonisation. After skeletonisation, one is prompted for the type of skeleton output desired. In both cases one is prompted for the output file name.