wavelength	cross sect.	uncertainty

270-279		2.18e-20	3.82e-22
280-289		2.83e-20	3.82e-22
290-299		3.36e-20	3.82e-22
300-309		3.63e-20	7.65e-22
310-319		3.52e-20	3.82e-22
320-329		2.98e-20	3.82e-22
330-339		1.95e-20	3.82e-22
340-349		1.34e-20	3.82e-22
350-359		1.19e-20	3.82e-22
360-369		3.59e-21	3.06e-22
370-379		2.98e-21	3.06e-22
380-389		1.19e-21	3.06e-22