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Radiation field units https://galprop.stanford.edu/forum/viewtopic.php?f=5&t=84 
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Author:  Aaron [ Mon Apr 19, 2010 11:41 am ] 
Post subject:  Radiation field units 
I am interested in using the interstellar radiation field data from astroph/0507119. I have downloaded the fits file from the galprop page. The fits header says that they are microns eV cm^3 microns^1. Am I correct in assuming that the data is therefore 1/ \lambda *dU/d\lambda, where U(E) is the energy density in eV/cm^3? Or is it rather 1/lambda dU/d(1/lambda)? It's a crucial distinction. thanks for your time. Aaron 
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