Stephanie Wrote:
-------------------------------------------------------
>
> The top of the text file has this information:
> #Col. 0 Node index
> #Col. 1 ROI val.
>
> The file has two columns, one with the nodes and
> the other has what I assume should be 0s and
> 1s(however around the nodes that should make up
> the ROI it is actually 3s).

That may indicate it's a 1D file, not a NIML file. That should be ok though; SUMA should still be able to read it.

> There is a total of
> 198811 nodes in the file.

I assume that nodes are numbered from 0 to 198811 (inclusive), for 198812 nodes in total, is that correct?
That would be consistent with using surfaces from MapIcosahedron with the ld=141 option, as for such surfaces, the number of nodes is 141^2*10+2=198812.

If you try:

suma -i std.141.lh.smoothwm.asc

can you then load the mask file?
If not, what is the output of:

SurfInfo std.141.lh.smoothwm.asc