def trunk_origin_radii(nrn, neurite_type=NeuriteType.all):
neurite_filter = is_type(neurite_type)<EOL>return [s.root_node.points[<NUM_LIT:0>][COLS.R] for s in nrn.neurites if neurite_filter(s)]<EOL>
radii of the trunk sections of neurites in a neuron