wavel.	cross section	error limit

220	8.03e-20	3.8e-22
225	4.66e-20	2.3e-21
230	2.9e-20		1.5e-21
235	1.0e-20		1.5e-21
240	9.6e-21		1.1e-21
245	5.0e-21		1.1e-21
250	3.8e-21		1.1e-21
255	4.6e-21		1.1e-21
260	1.1e-21		1.1e-21
265	3.1e-21		1.1e-21
270	3.1e-21		1.5e-21
275	1.5e-21		1.1e-21
285	3.8e-22		1.1e-21
290	7.6e-22		1.1e-21