Upper panel: ratios between the Hα fluxes estimated from a combination of different methods, which are independent of the NB118 data (ind; cf. Sects. 5.6 and 5.7), and those estimated based on the NB118 data using the TPV technique. Colors refer to the three considered filter pairs, while symbols have meanings as indicated in the legend, with combinations of the different symbols possible. Objects with strongly discrepant individual independent flux estimates are shown as faded. Lower panel: similar ratios as in the upper panel, but now using a generic NB estimation method instead of the TPV method.