T in K ctross sect. at 246 nm 1770 1.86e-20 1915 2.30e-20 2060 2.76e-20 2205 3.21e-20 2350 3.65e-20 2495 4.08e-20 2640 4.49e-20 2785 4.88e-20 2930 5.25e-20 3075 5.60e-20 3220 5.92e-20