Hello Rick,
The researcher that gave this to me said it was in MNI-152 space, but when I did a 3dinfo on it, it said the mask was in original space. Additionally, when I tried to look at it on the afni gui with the MNI-152 brain as the underlay and the mask as the overlay, I was not able to because they appeared to be in different spaces.
I have attached the file, if you would not mind taking a look at it. Let me know if this was attached okay. I emember I had trouble with attachments last time when I tried to send something to you.
Thanks,
Emily