Are there accurate ROIs on the reference histological data experiments ?


I am currently retrieving some of your data (“Mouse Connectivity” → “Reference Data” → “Reference Histological Data”).
It seems to me that the API (“Image-to-image Synchronization” → “Image-to_Atlas”) allows to registrate the CCfv3 ROIs on these data with three parameters x, y and z (sectionId).
This registration, visible in the web interface, seems to provide low accuracy ROIs.
I am wondering if more accurate ROIs on these data were available? If so, how can they be retrieved?