Tokens

A token is any string of non-whitespace surrounded by whitespace. Each time a token begins with a -, it is read to determine what follows it. The next token is then read and processed. The program will ignore any token that it doesn't recognize. The tokens that are recognized in a qtls.inp file are -Units, -end, -named, -start, -stop, -skip, -unskip, -interactions and -filetype.

Usually, only the first letter of these tokens is actually necessary (except for -start, -stop and -skip, which require more letters to distinguish between them).

Case is important. -Units is correct and is different from -units, which will be ignored.