Where several values in an argument to a parameter must be separated (like in
the 'irtap' option of the Fourier domain procedures) white space ( ), commas
(,), and semicolons (;) are allowed as field delimiters, at your convenience.

reason: libstfinv is used by IFOS2D and friends. The parameter file parser
used by these programs uses a comma to separate configuration parameters. This
conflicts with the meaning of a comma as field delimiter within on
configuration parameter.