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Dear FSL users, I have some questions on the output from oxford_asl: 1. perfusion.nii.gz - My understanding is that this image is the average of tag-control subtraction (is this correct?). Is it comparable for subjects scanned from the same scanner? For example, if I am interested in the correlation between two groups scanned in the same scanner, can I directly use this data without going through the calibration procedure? 2. What are perfusion_norm.nii.gz and perfusion_var.nii.gz? Thanks a lot, Jiyang