T in K cross sect. at 257 nm 2480 8.54e-21 2565 9.47e-21 2650 1.04e-20 2735 1.14e-20 2820 1.24e-20 2905 1.34e-20 2990 1.44e-20 3075 1.54e-20 3160 1.64e-20 3245 1.73e-20 3330 1.83e-20