$this->isobarCoord[$isobar][$ncoord++] = [
                            $this->getCrossingCoord($neigh[$n1][0], $neigh[$n1][1], $neigh[$n1][2], $ib),
                            $this->getCrossingCoord($neigh[$n2][0], $neigh[$n2][1], $neigh[$n2][2], $ib), ];