Hi Andrew,

As Yang indicated: all data are raw data, no preprocessing was applied and you will need to do your own QC.

The DTI data for the NKI/Rockland sample does include fieldmaps, however the DTI data for the Enhanced NKI/Rockland sample does not. It should be clear upon downloading which one you have (i.e., I'm guessing you downloaded group_0 of the Enhanced NKI-RS).

Cheers,
Maarten