Flux and velocity centroid of the Gaussians fitted on a pixel-by-pixel basis to the CO and HCN profiles (Sect. 3.2.2). The top row shows the integrated flux of the first (main) and second Gaussians, while the bottom row shows the corresponding velocity centroids. The white isovelocity contours displayed on the velocity maps cover the range [−60, 60] km s^-1, in intervals of 20 km s^-1. The colourbar and scales covered are shown in the right (in parenthesis for HCN). All maps show the same field of view, 30′′ × 33′′, with large tickmarks indicating a separation of 5′′. For reference, the dashed circle on the top-left panel has a radius of 5′′ (185 pc).