Crosscuts along the planes XY, XZ, and YZ through a spherical bubble with an inner radius of 100 pc and a thickness of 20 pc. The explosion center (black asterisk) is at the origin of the axes and at the center of the bubble. The direction of B⁰ is set by $\left({\theta }_{B^0},{\varphi }_{B^0}\right)=\left({60}^{°},0^{°}\right)$ in a spherical coordinate where θ = 0 points to positive Z and (θ, ϕ) = (0, 0) points to positive X. B⁰ belongs to the XZ plane. The background colors indicate the amplification of the total magnetic field in the plane (|B|/|B⁰|) and streamline the orientation of the projected B in the crosscut planes. The red arrow in the lower left corner of each panel indicates the projection of B⁰ in the planes. The red circle has a radius of B⁰ and indicates the maximum length of the arrow