wavel.	cross section 	error limit

200	6.31e-18	3.6e-19	
205	6.70e-18	1.8e-19
207	6.80e-18	2.0e-19
210	6.62e-18	4.5e-19
215	6.06e-18	1.9e-19
220	4.76e-18	5.1e-19
225	3.90e-18	3.5e-19
230	3.77e-18	1.2e-19
235	3.76e-18	5.7e-19
240	4.05e-18	1.6e-19
245	3.63e-18	5.1e-19
250	3.43e-18	2.9e-19
255	3.06e-18	2.4e-19
260	2.70e-18	4.3e-19
265	2.14e-18	4.0e-19
270	1.90e-18	4.0e-19
275	1.13e-18	2.7e-19