wavel.	cross section	error limit

210	3.05e-18	1.7e-19
220	3.77e-18	2.0e-19
230	4.48e-18	1.7e-19
240	4.77e-18	1.6e-19
250	4.55e-18	3.3e-19
260	3.62e-18	1.0e-19
270	2.29e-18	1.9e-19
280	1.36e-18	3.0e-20
290	6.80e-19	3.0e-20