[Freesurfer] 2 Questions about Parcellation

Hello,

We are beginning to explore the applicability of FreeSurfer for our research. Having done some initial runs, we have the following questions that I was hoping you might be able to address.

1.) For stats output, it seems there are two atlases for parcellation, resulting in ?h.aparc.stats and ?h.aparc.a2005s.stats. I was wondering if you could tell me which atlases were used during the manual parcellation that ultimately went into creating these two systems?

2.) We were wondering what the entity "unknown" refers to in the ? h.aparc.stats output. What is this capturing?

Thanks so much for any assistance you can provide and kudos on this amazing software!

Sincerely, Ray