Ambipolar diffusion regulated collapse for model C3a. The blue and red line show the evolution for X = 10-7 and X = 10-8 respectively, while the black line shows the evolution without magnetic fields. Panel a) shows the maximum (i.e. central) density, while panel b) shows the ratio of the line-mass to the critical value given by Eq. (7). The black dot shows the value for the equilibrium structure.
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