Density structure of unstable, prestellar, thermally supercritical cores, compared to the density of stable, starless, thermally subcritical cores. The subcritical cores are truncated at a high density, as would be appropriate for low‐mass cores in a high‐pressure environment. The density of the thermally supercritical cores decreases to a much lower value at the edge, consistent with a lower surrounding pressure. Parameters are listed in Table 1.