Radial velocity variability amplitude versus photometric variability amplitude of periodic variables in NGC 3766 having VLT/GIRAFFE spectra taken in this program. The RV variability amplitude Q_RV is computed using the 90−10% inter-percentile range. Indicator symbols and colors have the same meanings as in Fig. 2. Stars showing an RV variability amplitude larger than 7 km s^-1 are labeled with their star IDs next to the indicators.