Fig. 22
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Top: fraction of single transiting small planets with outer giant planets (OGP) vs. stellar metallicities derived from the Kepler-biased synthetic sample. Bottom: Orbital eccentricity vs. stellar metallicity for small transiting planets with and without OGPs (purple/green). The solid lines represent the corresponding best fits. The grey region denotes the 1 − σ interval of the eccentricity-[Fe/H] correlation derived from the LAMOST-Gaia-Kepler sample (An et al. 2023).
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