The plots produced by LIGPLOT can be customised by amending the parameter file called ligplot.prm. The file is created in the default directory when you first run LIGPLOT. You can then edit it with any text editor.
The file contains a number of keywords, in capitals, below which the parameters are entered. The keywords are:-
Other text can be inserted anywhere in the file and will be ignored provided that it is not in the block of parameters directly associated with one of these keywords.
Throughout the file are various notes to assist you during editing.