Three-dimensional rendering of the MHD simulation RUN2_G, describing the expansion of SN 1006 through a magnetized medium and its interaction with an ambient cloud at t = 1000 yr (the model parameters are shown in Table 1). The image is rotated to match the actual conditions of SN 1006 and the orientation of the observations (north is up and east is to the left). The ejecta material and the shocked ambient medium are tracked with a “solid” and a semi-transparent surface, respectively. The cutaway drawing of the southwestern cloud reveals its interior: the color code traces the density, which increases radially from 0.07 cm^-3 (dark blue) to 10 cm^-3 (red). The magnetic field lines are superimposed. The (projected) gradient of the magnetic field points toward southeast.