wavel.	cross sect.	error limit
-----------------------------------
280	2.04e-20	0.17e-20
285	3.52e-20	0.18e-20
290	1.08e-20	0.26e-20
295	3.76e-20	0.71e-20
300	8.10e-21	1.30e-21
305	4.20e-20	0.44e-20
310	1.27e-20	0.12e-20