Maps in Hα and of the electron density for N 49 displayed on a linear colour scale. The horizontal axis displays the right ascension coordinate and the vertical axis shows the declination offset from the reference star 2MASS 05255225-6605074. The pixel size is 2.3″ in right ascension and 5″ in declination. Panels: a) the Hα flux map; b) the mean electron density map from the sum of the Gaussian components of each line of the [S ii] doublet; c) electron density map from component 1 (blue); d) electron density map from component 2 (red).