wavel.	cross sect.	error limit
-----------------------------------
184.950	1.429e-19	0.006e-19
202.548	2.753e-20	0.009e-20
206.200	1.541e-20	0.007e-20
213.857	3.64e-21	0.01e-21
228.802	1.286e-22	0.004e-22