Color-magnitude diagrams for the IN objects. Top panel: comparison of log(F_Hα/f_λFUV) vs. FUV magnitude. The model evolutionary sequences for the standard Salpeter IMF (orange) and the most extreme truncated (M_u = 20 M_⊙; blue) and steep (α = 3.3; green) IMFs are shown as solid curves. The mass of each model cluster has been normalized so that they reach an age of 100 Myr at a FUV = 23.8 mag (marked with a vertical dot-dashed line). The direction of increasing cluster mass for the models is shown with a horizontal black arrow. The horizontal dashed line indicates the demarcation for Hα-bright clusters. The Hα-bright clusters that are also above the Salpeter mass completeness limit are marked with black dots. The observed points have been corrected for measured from the H I data and . The change in the position of observed points if is assumed to be larger by 0.1 mag is also shown with a black arrow. Bottom panel: same as the top panel but for FUV−NUV vs. FUV and with blue clusters marked with black dots. We used CMDs to find the Hα-bright and blue clusters in our complete samples.