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Dear FSL experts, I have used FSL for randomise: randomise -i 4Ddata.nii.gz -o tbss -m mask.nii.gz -d design.mat -t contrast.con -n 500 --T2 The 4Ddata contains 55 images, and that is a simple two group t test with covariate. For the covariate, it contains many decimal digits. When I do this in FSL 5.0.9, there is an error in the second contrast: unpermuted image contains no positive value, so a blank images is created. (but if I use the covariate with integral number, no problem) But when I do this in FSL 5.0.11, it's OK. Do you know why is that? Yours, Yulun Wu Faculty of Applied Sciences Delft University of Technology