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The range of values over which each 1D Gaussian are given by the following: s = s./VOX; % voxel sizes s1 = s/sqrt(8*log(2)); % FWHM -> Gaussian parameter x = round(6*s1(1)); x = -x:x; Best regards, -John On 23 May 2014 02:31, SPM Sophia <[log in to unmask]> wrote: > Thank you very much. > Then how can I determine the relationship between the size of mask and > FWHM? For example, if the FWHM is [8 8 8], how much is the actual size of > the mask? > > Best， > sophia. > >