wavel.	cross sect.	error limit
-----------------------------------
320	2.24e-19	0.07e-19
340	2.19e-19	0.08e-19
350	2.05e-19	0.18e-19
360	1.05e-19	0.01e-19
370	7.90e-20	0.01e-20
380	3.60e-20	0.03e-20
390	3.30e-20	0.01e-20
400	1.80e-20	0.01e-20
410	1.10e-20	0.01e-20
420	9.90e-21	0.012e-21