Emission-line-ratio classification of spatial regions. The distribution of measured emission line ratios in a BPT-diagram (left column) and spatially across the galaxy (middle column, usable data regions in grey) differ between example galaxies dominated by LINER-like emission (NGC 5216, top row), a galaxy dominated by star-formation (NGC 4210, middle row) and an AGN in a spiral host (UGC 11680, bottom row). The latter one is shown as an example but not part of our sample. Regions are colour-coded according to their position in the BPT diagram: green for LINER-like, orange for Seyfert-like, and blue for star-formation-like emission line ratios. Overlay of these regions onto the colour-composite image from the SDSS (right column) reveals how LINER-like emission is spatially extended, except when dominated by Seyfert-like emission in the centre or by star-formation-like emission in spiral arms or the disk.