Csurf "load2surf filled,T2" tickbox (right)

Load 2nd/3rd 3D tksurfer Volumes

When this checkbutton is ticked (default is off),
the second and third 3D volumes (currently fixed
names):

  2nd: filled[.mgz] and
  3rd: T2[.mgz]

are loaded into tksurfer when the lower-left
SURFACE button is clicked.

This only works if the first volume is also being
loaded ("surfload" checkbutton just above).

The auxiliary 3D image are used to help
re-positioning surfaces mainly controlled by the
data in the primary buffer.

The filled image prevents migration across the
callosum and out of the cut brainstem.

The T2 image is mainly used to prevent migration
out of inferotemporal cortex into the cerebellum.

This check is immediately unticked, whether or
not the volume(s) were successfully loaded.
