HST Paschen-α image (Dong et al. 2011) of the ring nebula around WR 102c. The legends and the arrows indicate (i) the helix-like nebulosity detected by Lau et al. (2016); (ii) the ring WR nebula as seen in the SINFONI Brγ image in Fig. 3; (iii) a small structure that resembles a helix-like outflow. The dashed rectangle corresponds to our SINFONI mosaic field. The orientation is the same as in Figs. 2 and 3, i.e. north is up and east is to the left. The image is a zoom into the Paschen-α survey of the Galactic centre (Wang et al. 2010).