wavel.	cross sect.	error limit
-----------------------------------
184.950	1.474e-19	0.001e-19
202.548	3.12e-20	0.01e-20
206.200	1.802e-20	0.006e-20
213.857	4.61e-21	0.03e-21
228.802	1.920e-22	0.007e-22