a) Normalised central density, ρ/ρS as a function of time for ambipolar diffusion regulated collapse of model C3b. b) Ratio of line mass to critical line mass with the black dot the value of the equilibrium profile. The squares show the ratio when the central density is 1000 ρS. The blue, red and green lines show the collapse for X = 10-8,10-7 and 10-6 respectively. The black line shows the collapse if no magnetic fields are present.
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