Starburstiness (R_SB) distribution of our sample, representative of the scatter around the main sequence, prior to constraining the extinction (top), and after constraining it to ensure energy balance (bottom). The thin dashed line denotes the ratios obtained with the SFRs inferred from L_IR and L_UV. The scatter is reduced when the extinction is constrained, especially below the MS (situated at zero in the plot). The sources remaining below it (green line) are discussed in Sect. 4.2.4 and on. The dashed magenta line shows the sources qualifying as starbursts, based on their distance from the MS.