Integrated emission (left panel), peak velocity (middle panel), and FWHM (right panel) of the Gaussian-decomposed, stacked Hnα (n = 151–158) emission. Crosses indicate infrared star clusters (Alves & Homeier 2003). The positions of the spectra shown in Fig. 3 are marked. The systemic velocity is marked in the color-bar of the middle panel (v_LSR = 8.6 km s−1; Quireza et al. 2006a). The contours represent integrated emission of the fitted Gaussian (shown in color in the left panel; at levels of 0.3, 0.4, 0.5, 0.6, 0.8, 1.0 and 1.2 Jy beam−1 km s−1).