Time series of the magnetic field of the OPU in AR 11967 (the one shown in Fig. 5) during its decay process. The individual columns show the observables of the OPU at different times, from 19:00 UT on 4 February 2014 to 10:40 UT on 5 February 2014. From top to bottom:I_c, B at log τ  =  0, B at log τ = −2.0, and strength of the horizontal magnetic field at log τ = −2.0. All panels have a FOV of $22\stackrel{″}{.}4\times 22\stackrel{″}{.}4$ and the red contours indicate the orphan penumbra and its remains. The arrows in the top row point towards disk centre.