Bill David's macro "Wifd_pkshape" is used for a number of neutron diffraction peak profiles from ISIS, is there any description of the physical meaning of all of the refineable values for this macro. There is a note saying to look at the "isis tf14ls manuals" however a search of Google, this website and the ISIS website doesn't seem to come up with anything.
http://topas.dur.ac.uk/topaswiki/doku.php?id=wifd_pkshape
Many thanks for any help,
Sam