wavel.	cross sect.	error limit
-----------------------------------
184.950	1.521e-19	0.002e-19
202.548	3.540e-20	0.008e-20
206.200	2.090e-20	0.007e-20
213.857	5.76e-21	0.02e-21
228.802	2.812e-22	0.008e-22