wavel.	cross section	error limit

210	2.00e-18	4.0e-19
215	2.10e-18	6.0e-19
220	2.32e-18	5.0e-19
225	2.64e-18	6.0e-19
230	2.84e-18	2.0e-19
235	3.11e-18	4.0e-19
240	3.19e-18	4.0e-19
245	3.72e-18	5.0e-19
250	3.60e-18	2.0e-19
255	3.70e-18	5.0e-19
260	3.70e-18	4.0e-19
265	3.55e-18	3.0e-19
270	3.07e-18	5.0e-19