Longitude–velocity diagram at +40° ≤ b ≤ +60° for the warm gas component of our model of fountain wakes (left-hand panel), fountain outflows (middle panel) and fountain wakes+outflows (right-hand panel). The points represent the warm detections from Lehner et al. (2012). Contour levels from the innermost to the outermost at 1, 2 and 3σ (see Section 2.4).