Changes in performance (f₁ score) of SQUEzE when training with the different peak finders. The orange line shows the performance of the original peak finder, PeakFinder, compared to the peak finder developed here, PeakFinderPowerLaw, our fiducial choice. The left (right) panel shows the performance for the low (high) redshift quasars. For the original peak finder, we use the following parameters: four magnitude bins, no smoothing, a minimum significance of zero, using the default set of lines, using two random forests, and adding columns z_try and magnitude r. These parameters are selected following the approach described in Appendix C for the new peak finder.