wavel.	cross section	error limit
-----------------------------------
313.5	7.12e-18	6.0e-19
317.0	1.01e-17	8.0e-19
320.8	1.18e-17	1.0e-18
325.0	1.13e-17	9.0e-19
329.1	1.13e-17	9.0e-19
333.5	1.21e-17	1.0e-18
338.3	1.55e-17	1.3e-18
343.7	9.35e-18	7.8e-19
348.8	7.03e-18	5.9e-19
354.7	7.22e-18	6.1e-19
360.4	2.64e-18	2.6e-19
367.7	1.45e-18	1.8e-19
374.5	9.00e-19	1.6e-19