Evolution of planetary mass by pebble accretion of four planetary seeds. The initial mass of the planets is 0.01 M_⊙ and all of them are in circular orbits. Two of them are initially located at a = 0.1 au (blue lines) and the other two at a = 1 au (red lines). Two of them are affected by gas disk interactions (dotted lines) and two of them are not affected by such interactions (solid lines). The red and blue dots represent the isolation mass reached by each planet.