wavel.	cross sect.	error limit
-----------------------------------
311.0	1.55e-19	0.2e-19
317.3	1.02e-19	0.1e-19
324.0	8.4e-20		0.3e-20
329.8	6.2e-20		0.1e-20
337.0	3.9e-20		0.2e-20
344.3	3.0e-20		0.4e-20
351.8	1.5e-20		0.3e-20