I got the result of glm output by --glm_output option in randomise. And I want to know whether regressor positively or negtively correlated GM data in significant corrected areas.

As I had 5 regressors, I got five *_glm_pe_tstat* files. Because of the 2th regressor had a corrected regions, I viewed *_glm_pe_tstat2.nii.gz. However this file had contained 5 volumes, I wonder from which volume I could get the beta value to know it was positive or negtive.