wavel.	cross sect. 	error limit

210	2.21e-18	0.25e-18
220	3.56e-18	0.41e-18
230	4.49e-18	0.55e-18
240	4.89e-18	0.60e-18
250	4.48e-18	0.50e-18
260	3.48e-18	0.38e-18
270	2.31e-18	0.26e-18
280	1.32e-18	0.15e-18
290	5.5e-18		0.9e-19