==================
Cl2 cross sections
JPL 2006
==================
260    1.98e-21
270    8.24e-21
280    2.58e-20
290    6.22e-20
300    1.19e-19
310    1.85e-19
320    2.37e-19
330    2.55e-19
340    2.35e-19
350    1.88e-19
360    1.32e-19
370    8.41e-20
380    5.00e-20
390    2.94e-20
400    1.84e-20
410    1.27e-20
420    9.56e-21
430    7.32e-21
440    5.46e-21
450    3.87e-21
460    2.58e-21
470    1.62e-21
480    9.57e-22
490    5.34e-22
500    2.83e-22
510    1.42e-22
520    6.81e-23
530    3.13e-23
540    1.37e-23
550    5.81e-24