Reconstruction of the transverse component of the magnetic field vector from ME inversions of the Fe I 617.3 nm. Left: unconstrained reconstruction where each pixel has been inverted six times with five different random initialisations. Middle-left: reconstruction with spatial regularisation, where all pixels have only been inverted once. Middle-right: reconstruction with temporal regularisation. Right: reconstruction including temporal, spatial, and low-norm regularisation terms. A movie with the time-evolution is available https://www.aanda.org/10.1051/0004-6361/202348810/olm.