Gemini North three-colour JHK′ image of AFGL 2591 overlaid with contours of C¹⁸O emission integrated over –4.3 to −3.3 km s^-1 (red) and –8.0 to –7.0 km s^-1 (blue). The three arcs in the east of the image show the positions of bow shocks visible in the Gemini North image, which are too faint to be seen directly in the figure. The dashed line shows the direction of the ionized jet observed at 3.6 cm (PA 100°), and yellow diamonds show roughly the peak positions of the H₂ knots observed in Tamura & Yamashita (1992). Red-shifted contours are –3, 3, 4, 5, 6  ×  0.1 Jy beam^-1 km s^-1 and blue-shifted contours are –3, 3, 4, 5, 6, 7  ×  0.1 Jy beam^-1 km s^-1. The synthesised beam is shown in the lower left-hand corner (4.5′′ ×  3.6′′, PA 93°). Near-IR image stretch as in Fig. 7.