Zoom-in on the evolution of the line-of-sight magnetic field at various τ levels in the region of the studied feature. Left: Evolution of the vertical component of the magnetic field, B_z at the photosphere (τ₅₀₀ = 1). The feature from the proxy is overplotted in purple. The dashed red box indicates the region of flux cancellation. Centre: Evolution of B_z in the middle photopshere (τ₅₀₀ = 0.01). The grey scale for the magnetic field (B_z) ranges from −500 G to 500 G at the τ₅₀₀ = 1 surface and from −100 G to 100 G at the τ₅₀₀ = 0.01 surface. The regions of enhanced current density (75% above the mean) are plotted with the cyan contours in both the left and central panels. Right: Zoom-in on the evolution of the feature in the proxy as viewed on disc. A movie spanning the lifetime of the feature is available online.