t/M = 0.00	t/M = 7.9
t/M = 11.9	t/M = 12.1
t/M = 17.0	t/M = 20.7

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Snapshots of the interior and exterior magnetic field lines at select maximal time slices for the same collapse depicted in the Schwarzschild gauge. The star again collapses from rest at an initial areal radius R_s(0) = 4M. Points are plotted in a meridional plane using areal radii. The light shaded sphere covers the matter interior; the black shaded sphere covers the region inside the event horizon. Soon after the last snapshot at t = 20.7 grid stretching causes the quality of the numerical integration to deteriorate in this gauge.

t/M = 0.00	t/M = 7.9
t/M = 11.9	t/M = 12.1
t/M = 17.0	t/M = 20.7

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Blow-up of the same collapse . Note how in this gauge the stellar surface approaches a limit surface at r_s ≈  3/2 M at late times. The horizon grows to its final value r_s = 2M once all the matter crosses inside this radius.