Difference in the emission-line flux measured in the ground-based (GB) and the grism spectra (ACS) (Δlog Flux = log Flux_GB − log Flux_ACS) as a function of the ACS emission-line flux. Grey/red points are before/after a tailored extraction. Only lines with  ≥ 3σ detections in both measurements are shown. The solid line indicates a 1:1 relation. Points above the solid line indicate too low flux measurements in the grism spectra.