Spectrum of Cosmic Diffuse Background Radiation

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Left ordinate:
Log(photons s^-1 cm^-2 sr^-1 nm^-1)
Right ordinate:
Log(column density cm^-2)
...right ordinate refers to
the three jagged interstellar medium
photo-ionization cross-section
curves in the middle of the plot
click on the image
to get a magnified view
of the BEST (red) regime
without the ism curves