wavel.	cross sect.	error limit
-----------------------------------
206.4	1.58e-17	2.0e-18
210.0	1.73e-17	1.2e-18
213.9	1.84e-17	9.0e-19
217.9	2.01e-17	1.1e-18
224.9	1.89e-17	1.1e-18
231.9	1.36e-17	1.4e-18
243.8	7.9e-18		1.0e-18
255.8	2.9e-18		4.0e-19