Spatial distribution maps of selected emission line ratios for the Bright Bar (left-hand side) and NE-Orion-S (right-hand side) taken from [37]. The sum of [N II] 6548, 6584 Å and [O III] 4959, 5007 Å nebular lines have been used to derive the [N II]/H (middle) and [O III]/H (bottom) ratios, respectively. H contours are overplotted in all maps.
