wavelength	cross sect.	uncertainty

270-279		2.18e-20	3.82e-22
280-289		2.71e-20	3.82e-22
290-299		3.29e-20	3.82e-22
300-309		3.61e-20	3.82e-22
310-319		3.56e-20	3.82e-22
320-329		3.10e-20	3.82e-22
330-339		2.18e-20	3.82e-22
340-349		1.57e-20	3.82e-22
350-359		1.34e-20	3.82e-22
360-369		4.86e-21	2.68e-22
370-379		3.75e-21	2.68e-22
380-389		1.45e-21	2.68e-22
390-399		6.50e-22	2.68e-22