H2 and He laboratory data and van der Waals vapour curve derived from Maxwell construct. Adiabatic compression curves of an initial sphere to sheet-, filament- and point-like geometries for interstellar conditions (T = 10 K, P = 10-12 Pa) are shown, as explained in Appendix B. Sheet-like collapses are allowed to reach the phase transition regime even without cooling. Cooling would displaces the curves to lower temperature.
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