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Hi Hauke - rather simple I'm afraid, the GUI just runs avwstats INPUT -r to get the "robust" intensity range and then sets bt to be 10% of the difference between the resulting min and max.... Cheers. On Thu, 27 Nov 2003, Hauke R. Heekeren wrote: > Dear all, > quick question: how does Susan (the GUI) compute the > brightness threshold (bt)? We'd like to use this with > susan_smooth. > > thanks and happy thanksgiving, > > Hauke > Stephen M. Smith DPhil Associate Director, FMRIB and Analysis Research Coordinator Oxford University Centre for Functional MRI of the Brain John Radcliffe Hospital, Headington, Oxford OX3 9DU, UK +44 (0) 1865 222726 (fax 222717) [log in to unmask] http://www.fmrib.ox.ac.uk/~steve