wavel.	cross section	error limit

200	8.60e-19	6.8e-19
210	1.32e-18	5.8e-19
220	1.82e-18	2.6e-19
230	2.19e-18	2.2e-19
240	1.85e-18	3.5e-19
250	1.42e-18	2.5e-19
260	1.39e-18	3.9e-19
270	1.95e-18	1.4e-19
280	2.07e-18	1.1e-19
290	2.47e-18	3.1e-19
300	2.36e-18	1.1e-19
310	2.34e-18	1.1e-19
320	2.00e-18	2.0e-19
330	1.57e-18	2.2e-19
340	1.30e-18	2.0e-19