> > Hi Justin, you're right - it shouldn't ever do that. However, (in my desperate defence) it hasn't ever done that for me. Could you tell me how large the spectral region (in points) was that you picked? I wouldn't recommend going above 15 x 15 when you're first trying the code out. If you were at this size and the app crashed then there is something more serious going on. Hi Dan, This is the region I used. http://tinyurl.com/38ttms3 justin -- Justin Lecher Institute for Neuroscience and Biophysics ISB 3 - Institute for structural biochemistry Research Centre Juelich GmbH, 52425 Juelich,Germany phone: +49 2461 61 2117