wavel.	cross sect.	uncertainty

260	1.66e-17	1.53e-19
270	1.88e-17	1.53e-19
280	1.56e-17	1.15e-19
290	7.91e-18	7.65e-20
300	2.92e-18	2.68e-20
310	1.41e-18	2.29e-20
320	6.96e-19	1.91e-20
330	2.33e-19	1.91e-20
340	4.97e-20	3.06e-20