wavel.	cross sect.	uncertainty

260	1.64e-17	3.82e-20
270	1.87e-17	3.82e-19
280	1.65e-17	3.44e-19
290	9.64e-18	1.91e-19
300	4.21e-18	1.15e-19
310	2.33e-18	1.15e-19
320	6.88e-19	7.65e-20
330	2.33e-19	7.65e-20
340	5.74e-19	7.65e-20