wavel.	cross sect.	uncertainty

260	1.54e-17	2.68e-19
270	1.83e-17	2.68e-19
280	1.49e-17	2.29e-19
290	6.54e-18	1.15e-19
300	2.10e-18	3.82e-20
310	1.04e-18	3.44e-20
320	4.47e-19	3.06e-20
330	8.79e-20	2.68e-20