Grouped region names of connectivity features do not match the region name str of features objects
import siibra
feats = siibra.features.get(siibra.parcellations["julich 2.9"], "connectivity")
print(feats[0].regions)
print(feats[0].get_matrix().columns)
See the region names that start with "Group". The columns of the matrix are region objects and when grouped, they are tuples (relatively recent change.) IMO, ideally, the user should be able to pull data from the dataframe with the strings of feature.regions
.