Effects of removing the variable k₀. They are best visible in PGC 015524 (top) and PGC 019085 (bottom). Left: Original velocity map extracted using the pPXF from a binned MUSE cube. Middle left: Maps of the k₀ term in the harmonic analysis obtained with KINEMETRY on the original velocity maps. Note the different colour scales compared to other plots. Middle right: Corrected velocity map obtained by subtracting the k₀ value from each bin from the original velocity map. Right: Velocity maps obtained through pPXF extraction as in the leftmost panels but after first removing a representative halo spectrum (see text for details). Only bins with S/rN> 7 are plotted.