wavel.	cross sect.	1 sigma standard dev.

510	3.21e-22	1.80e-23
515	2.77e-22	1.64e-23
520	2.12e-22	1.50e-23
525	1.61e-22	1.35e-23
530	1.19e-22	1.17e-23
535	8.20e-23	9.15e-24