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Fig. 2

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Equilibrium temperature and pressure as a function of density. These equilibrium curves were computed equating the heating and cooling processes described in Wolfire et al. (1995, 2003). The dashed line corresponds to the average pressure of the cold diffuse ISM measured by Jenkins & Tripp (2011). The dotted lines show the maximum and minimum pressures that include 99% of the data of Jenkins & Tripp (2011). The dash-dotted lines show the density range of the thermally unstable phase.

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