wavelength	cross sect.	uncertainty

270-279		1.72e-20	7.65e-22
280-289		1.99e-20	7.65e-22
290-299		2.56e-20	7.65e-22
300-309		2.68e-20	3.82e-22
310-319		2.79e-20	7.65e-22
320-329		2.41e-20	7.65e-22
330-339		1.49e-20	7.65e-22
340-349		8.03e-21	7.65e-22
350-359		7.65e-21	7.65e-22
360-369		1.53e-21	7.65e-22