Flux (top panel) and velocity dispersion (bottom panel) ratios of [O III]λ5007 to [O III]λ4959 as a function of the S/N of [O III]λ4959 measured on the peak of the line using all data included in the MEGADES survey. In both cases, the shaded region between the dashed red lines marks the position of the 10th and 90th percentiles. The solid red line indicates the median value of the flux or velocity dispersion ratio at each S/N value.