wavel.	cross section 	error limit

210	2.13e-18	4.1e-19
215	2.73e-18	4.4e-19
220	3.25e-18	6.2e-19
225	3.84e-18	2.7e-19
230	4.23e-18	2.5e-19
235	4.47e-18	1.1e-19
240	4.52e-18	1.1e-19
245	4.43e-18	1.0e-19
250	4.14e-18	9.9e-20
255	3.77e-18	1.2e-19
260	3.34e-18	1.1e-19
265	2.85e-18	1.3e-19
270	2.36e-18	1.5e-19
275	1.90e-18	2.0e-19
280	1.47e-18	2.3e-19
285	1.10e-18	2.8e-19
290	7.80e-19	1.9e-19
295	5.40e-19	1.2e-12