ALMA image of the red supergiant star Wd1-26 shown in colour-scale with Hα (top-left) and radio (top-right) contours overlaid. The Hα image is that presented in Wright et al. (2014) from the VPHAS survey of the region and the contours are plotted at × 3σ where σ is 64 μ Jy beam⁻¹. The radio contours are from recent ATCA observations of Westerlund 1 at 8.6 GHz with contours plotted at −1,1,1.41,2,2.82,4,5.66,8,11.31,16,22.62,32,45.25,64,90.50 × 0.304 mJy beam⁻¹ (see Andrews et al. 2018, for further details). Also shown are the YHG Wd1-32 (bottom-left) and the RSG Wd1-75 (bottom-right) with 3-mm emission in colour-scale and radio contours plotted as for Wd1-26 at multiples of 0.112 and 0.087 mJy beam⁻¹.