Hi Graham,
You supply some unique sub-string, matching the
coordinate file (e.g. smoothwm might match a coord
file of lh.smoothwm.asc). The exact style for coord
file names depends on the program that creates them.
The '-surf_A' option description in '3dVol2Surf -help'
gives a good description. The examples section may
be worth noting, too.
If you don't have '-surf_A' in your 3dVol2Surf commands,
then you don't have the current version of the program.
Please let me know if you are having trouble getting
the current version. It should be 3.8 (3dVol2Surf -ver).
BTW, 3.9 is coming pretty soon (or will it be 4.0?).
The web version of -help output is now up to date.
Thanks for mentioning it.
- rick