Vertical cuts of the reconstructed magnetic field. The upper panel shows a reconstruction of B_∥ with the weak-field approximation from the 854.2 nm dataset along a cut indicated with red markers in Fig. 3. The black curve shows the unconstrained reconstruction, and the red curve shows the reconstruction with both spatial and temporal regularisation. A similar plot is shown in the lower panel for the reconstruction of B_⊥ from the ME inversion of the 617.3 nm dataset presented in Fig. 7.