Hi, 

I've exported a t-score map from AFNI and loaded as an overlay in MRIcroGL. 

My understanding is that Min and Max value should correspond to min and max t-scores. However, that does not seem the case.
My t-scores range from -6 to +6. It seems to me that the lowest minimum value that can be chosen for an overlay is 1. 

Could you please help with this issue? 
All the best, 
irene