In clipper, the Richardson's data is hard coded, but the contour levels are not. So there is no library issue with changing the contour levels. Paul Emsley wrote: > On Thu, 2007-05-24 at 10:03 +0800, Charlie Bond wrote: > >>Could it be user configurable or is the data hard-coded? User control >>has some dangers, but choosing contour levels can be pretty subjective >>anyway. > > > Yes, I think this can be done. > >