Dynamical structure of the 1:1 resonances while the planets are still embedded in the disc, on the left Kepler-413 and on the right Kepler-47. Top: semi-major axis difference of the planets vs. the difference in mean longitude. The colour changes linearly from blue to yellow over the time span displayed in the lower panels. The red dots indicate the location of the Lagrange points L4 and L5 in the case of circular motion. Bottom: angular distance between the planets vs. time.