Maps of physical properties of the ionised gas in the Teacup. Extinction A_V from Hα/Hβ (top-left) and Hγ/Hβ (top-right), electron density (from [S II] λ6716/λ6731; bottom-left), and electron temperature (from [O III] (λ5007+λ4959)/λ4363; bottom-right). The line fluxes involved in the line ratios employed for the maps are those of the total modelled emission line profiles (with one, two, or three Gaussians). The maps are zoomed in the central 20″ × 20″.