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The Excited and Exciting ISM in Galaxies: PDRs, XDRs ... - Caltech

The Excited and Exciting ISM in Galaxies: PDRs, XDRs ... - Caltech

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<strong>The</strong> T-n phase diagram<br />

Gas that is ly<strong>in</strong>g beh<strong>in</strong>d the high densities<br />

is shielded <strong>and</strong> cold (but >10 K)‏<br />

color represents<br />

column density

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