wavel.	cross sect.	uncertainty

260	6.92e-19	1.91e-20
270	5.66e-19	1.53e-20
280	2.49e-19	7.65e-21
290	7.11e-20	3.06e-21
300	2.14e-20	2.68e-21
310	7.65e-21	2.68e-21