wavel.	cross section	error limit

220	6.70e-18	1.2e-18
225	5.60e-18	1.7e-18
230	5.00e-18	6.0e-19
235	4.70e-18	6.0e-19
240	4.90e-18	7.0e-19
245	5.00e-18	6.5e-19
250	4.80e-18	4.0e-19
255	3.90e-18	8.0e-19
260	3.80e-18	5.0e-19
265	2.50e-18	5.0e-19
270	2.25e-18	3.0e-19
275	1.70e-18	2.0e-19
280	1.70e-18	2.0e-19