Residual after subtraction of stellar velocity field from ionised gas (left) and molecular gas (middle). The streaming motion in the south-east coincides with the streaming motion that Salak et al. (2016) observe in CO. To guide the eye, we adopt the white crosses from their Fig. 29 a. Right panel: HST F814W (I-band) map. Comparison of the residual velocities with the optical map shows that possible inflow motions coincide with dust lanes.