IPD parameter ipd_gof_harmonic_amplitude (IPDgofha) versus the astrometric fit quality parameter RUWE in log-log scale. The vertical grey lines indicate the RUWE threshold value above which the results of the astrometric fit were invalidated. Left: targets colour-coded depending on their respective classification (EHe, dLHdC, RCB or DYPer type stars) and their location. The names of a few prominent targets are indicated. Right: targets colour-coded by the ratio G mean flux to its standard error (RFG) on a log scale.