@pimms.value<EOL><INDENT>def lh_white_indices(lh_white_mask):<DEDENT>
if lh_white_mask is None: return None<EOL>if is_image(lh_white_mask): lh_white_mask = lh_white_mask.get_data()<EOL>idcs = np.transpose(np.where(lh_white_mask))<EOL>return frozenset([tuple(row) for row in idcs])<EOL>
sub.lh_white_indices is a frozenset of the indices of the white voxels in the given
subject's lh, represented as 3-tuples.