Close-up of the protospot at 4:12 UT (top row) and 13:00 UT (bottom row) as seen in (from left to right) intensity maps, magnetic inclination, magnetic tension, magnetic field strength resulting from extrapolation, vertical and horizontal currents. All colour coding identical to previous images except for inclination, where dark green corresponds to 110 deg. The arrows point to the centre of gravity of the T_m enhancements.