Representative selection of the images used in our study, together with the apertures used for the three regions (the polygonal shapes) and the disc (the elliptical shape). The elliptical apertures are selected in order to ensure full coverage of the emission of the whole disc. The apertures for the regions in the disc cover three different star-forming regions that are observed in Hα and UV images. The field of view of each image is 170″ × 176″. The CARMA and VLA maps show the velocity-integrated intensities. The white ellipse (lower left corner) in the CARMA and VLA images represents the beam size for each image.