T in K cross sect. at 216.4 nm 1825 5.63e-21 2045 1.03e-20 2265 1.66e-20 2485 2.48e-20 2705 3.46e-20 2925 4.59e-20 3145 5.85e-20 3365 7.23e-20 3585 8.71e-20 3805 1.03e-19 4025 1.19e-19