wavel.	cross sect.	error limit

210	1.74e-18	0.20e-18
220	2.77e-18	0.20e-18
230	3.58e-18	0.16e-18
240	3.77e-18	0.19e-18
250	3.38e-18	0.22e-18
260	2.86e-18	0.28e-18
270	1.85e-18	0.22e-18
280	1.16e-18	0.18e-18
290	6.5e-19		1.0e-19