wavel.	cross section	error limit
-----------------------------------
313.5	9.38e-18	7.1e-19
317.0	1.36e-17	1.0e-18
320.8	1.57e-17	1.2e-18
325.0	1.43e-17	1.1e-18
329.1	1.39e-17	1.0e-18
333.5	1.47e-17	1.1e-18
338.3	1.95e-17	1.4e-18
343.7	1.11e-17	8.0e-19
348.8	8.96e-18	6.8e-19
354.7	1.05e-17	8.0e-19
360.4	3.44e-18	3.2e-19
367.7	1.54e-18	2.3e-19
374.5	9.60e-19	2.1e-19