I am having problems creating the nu_noneck file in fs500. Using the default stream, the front and back of the brain is clipped off, which seems to be causing significantly bad surfaces downstream. I changed the radius to 45 so that all of the brain is included, but then too much neck is left over, causing bad surfaces and a bad aseg downstream. The nu_noneck file seems to be fine from the fs510 reconstruction. Can I just copy it over from there? If not, are there any recommendations on how to get a useful nu_noneck file?