Plasma beta, the ratio between thermal and magnetic pressures, β = P_therm∕P_mag, evaluated within one (orange) and three (green) times the disk scale height. The disk is highly demagnetized because ambipolar diffusion leaves the field lines outside during the collapse. The β value passes through unity around the junction between the disk and the envelope. The difference between the two curves comes from the lower magnetization level close to the disk midplane.