wavel.	cross sect.	uncertainty

260	1.58e-17	1.53e-19
270	1.80e-17	1.53e-19
280	1.38e-17	1.15e-19
290	5.09e-18	3.82e-20
300	1.54e-18	2.29e-20
310	8.03e-19	1.91e-20
320	2.91e-19	1.91e-20
330	4.21e-20	1.91e-20