Eccentricity (panel a), pebble accretion efficiency (panel b) and mass of the embryo (panel c) vs total mass of drifting pebbles (lower x-axis) and time (upper x-axis). The black line corresponds to the resonant case with type I migration and resonance trapping, while the red line represents the non-resonant, comparison case that the embryo without type I migration moves on a nearly circular orbit.