b1617 b1616 b1615 b1618
b1617 0 1580.64986635244 1073.00232991359 2638.95149633334
b1616 1580.64986635244 0 1182.70030016061 991.776184428725
b1615 1073.00232991359 1182.70030016061 0 166.168589089515
b1618 2638.95149633334 991.776184428725 166.168589089515 0