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sorry for the simplistic question in advance.

I have DTI images for two groups of individuals with two visits each. I successfully ran TBSS and made a paired design matrix in Glm_gui. I used randomize to make the group comparisons. I guess I don't quite understand the output file. I have zstatn.nii.gz outputs for each of my n contrasts. When I open those files in fslview it appears they are not thresholded. How do I threshold these zstat files if I want to look at p values of .01 and and .05? 

Thanks for all your help!