Flux ratio of the peaks shown as a function of the EW₀ in Å (with a logarithmic scale). Filled green dots show objects with UV continuum counterparts, empty green dots show objects with lower limits for EW₀. The flux ratio is defined as the fraction of the line flux of the blue bump compared to the total line flux (blue bump and red, main peak). The black dots show the median peak ratio (including lower limits) in bins of Δ(log₁₀(EW₀)) = 0.2, the width of which is shown as the x-axis error bars. The y-axis error bars show the first and last quartiles. The Spearman rank correlation coefficient and p-value are given in the plot. The grey dashed line marks a ratio of 0.5, meaning above this value, the blue line is stronger than the red peak. The panel on the right shows histograms for the flux ratios of the peaks divided into the half of the objects with higher EW₀ (green) and lower EW₀ (blue). The p-value based on the Kolmogorov Smirnow (KS) test is shown below the legend of the histogram, indicating the low likelihood that both distributions are taken from a common parent sample.