wavel.	cross section	error limit

230	3.36e-18	2.7e-19
235	3.58e-18	2.8e-19
240	3.59e-18	1.1e-19
250	3.35e-18	1.0e-19
260	2.73e-18	1.3e-19
270	2.17e-18	1.2e-19
280	1.38e-18	1.8e-19
290	9.50e-19	1.5e-19