wavel.	cross sect.	uncertainty

260	1.56e-17	2.68e-19
270	1.89e-17	2.68e-19
280	1.72e-17	2.29e-19
290	1.08e-17	1.53e-19
300	4.97e-18	7.65e-20
310	2.45e-18	7.65e-20
320	1.34e-18	3.82e-20
330	6.50e-19	3.82e-20
340	2.68e-19	3.82e-20