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Hi, Yes, the mean is added back in after filtering to make sure that the output can be entered eg into feat without problems. Hth Christian On 12.10.2011, at 05:23, Satrajit Ghosh <[log in to unmask]> wrote: > hi, > > i'm trying to remove some nuisance regressors and demean a 4d time series using fsl_regfilt. i have a text file containing my nuisance regressors and a column of ones. the output of fsl_regfilt is not demeaned. if i repeat this exercise with fsl_glm and look at the residual time course, it's demeaned. is not demeaning the intended behavior of fsl_regfilt? > > cheers, > > satra >