Vol/Surf Outline
The Volume Surface Outline tab (Vol/Surf Outline for short) in the Overlay Toolbox allows one to set parameters for viewing brain surface outlines on volume slices in the Volume or All (Whole Brain) Viewing Tabs (inactive in all other Views). 

This is useful for comparing Freesurfer, or otherwise reconstructed, surfaces with volume slices, as a check of the quality of the surface.  It is also useful for viewing Connectivity data (dense connectivity and BOLD dense data series files) on both the cortical ribbon and in subcortical voxels.

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