wavel.	cross section	error limit

220	8.20e-18	4.0e-19
225	6.60e-18	2.5e-19
230	5.30e-18	1.5e-19
235	5.10e-18	3.5e-19
240	5.00e-18	4.0e-19
245	5.30e-18	2.0e-19
250	4.70e-18	2.0e-19
255	4.30e-18	2.0e-19
260	3.90e-18	2.0e-19
265	2.60e-18	2.0e-19
270	2.25e-18	1.0e-19
275	1.90e-18	1.0e-19
280	1.60e-18	1.0e-19