Distribution of relative parallax errors in the FPR, excluding 92 sources with negative parallaxes. In the top panel, the histograms represent the full FPR (gray curve), the TQS (orange curve), and the sources that are not part of the TQS (purple). In the bottom panel, they indicate the sources identified as pulsating LPVs (red), LPVs showing a LSP (green), or ELL (blue). Note that the histograms in the bottom panel are normalized to their area. For each subset, the vertical line indicates the median relative error, which is reported as a percentage in the legends.