afni.nimh.nih.gov

Hello,

I am trying to understand exactly how the lim command makes ROIs when using ROIgrow. The help function lists it as:
"Distance to cover from each node. The units of LIM are those of the surface's node coordinates. Distances are calculated along the surface's mesh."

If I wanted to make the ROI have a 6mm radius, would using of lim of 6 be similar? Is there some further explanation of the units?

Thank you,
Stephanie