Local evolution at R = 10 AU for M_disk = 0.01M_⊙ of the normalized column density for different values of the trap efficiency parameter ɛ (indicated by different colors). Top panel: evolution of the planetesimal column density. Middle panel: both primordial (solid lines) and collisional pebble populations (dashed lines). Bottom panel: primordial dust (solid lines) and its collisional counterpart (dashed lines).