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Hi Not sure what you mean - can you send the plot? Also, what's the dimension of the data and is this simulated data? cheers christian On 10 Dec 2009, at 12:12, Kundu, Prantik (NIH/NIMH) [F] wrote: > Hi Steve and Christian (and others) > > Hope you're well. When I run melodic (with minimal manipulation, via cmd line) on a dataset with only 3 axial slices I get an PPCA eigenspectrum with sharp discontinuities in the curve. What could this mean? The explained_variance curve looks normal (no discontinuities) > > -Prantik