Hα and [N II] spectral lines from the simulation M5V15W, after 0.1 Myr of evolution. The solid lines show the simulation, and the dotted lines with points show the observations to the WNW of W26. The panels show a) line brightness; b) line ratio [N II]/Hα; and c) radial velocity of the peak emission, all as a function of distance from the star. Vertical dotted lines in panel a) show the range of radii used to set the normalisation of the simulated and observed [N II] line brightness.