wavel.	cross section	error limit
			(standard dev.)
305	3.72e-21	1.9e-22
315	1.98e-21	2.0e-22
320	1.53e-21	1.5e-22
325	1.19e-21	8.0e-23
330	9.00e-22	6.0e-23
335	7.10e-22	8.0e-23
340	5.50e-22	7.0e-23
345	4.30e-22	6.0e-23
350	3.30e-22	7.0e-23
355	2.49e-22