TiO₂ morphology. Colour maps of emission at 310.78 GHz integrated over the ν_LSR-ranges indicated at the top left of each panel, cut off at 3σ. Red contours show the 321 GHz continuum at [3, 20, 40, 60, 80] σ; green contours show HST emission at [3, 5, 7, 10, 20, 30, 40, 50, 100, 200] σ (Smith et al. 2001). In the first panel we mark the position of the star (+, VY; black) and of the continuum component (x, C; red) to the south-east (O+15; R+14), and the position and approximate extent of the south-west clump (SW, dashed 1′′ diameter circle; red Shenoy et al. 2013). The apparent north-south emission is thought to arise from dynamic-range limitations in the peak channels.