Expansion of a single bubble in a low magnetic field (top, plasma β = 10) and high magnetic field (bottom, plasma β = 1, analogous to runs mhd1r and mhd1t, but with much lower levels of turbulence). The image in gray scale is the logarithm of the hydrogen column density in log (cm^-2) and the arrows show the projected magnetic field, color coded according to its magnitude in μG. The plots correspond to t = 0.2 Myr for both simulations.