Illustrative example of planetary growth tracks satisfying the selection conditions associated with the black box in Fig. C.1 (see main text for details). The growth tracks are projected in the semimajor axis–planetary mass space. The red curves are for planets formed in discs dominated by millimetre-sized pebbles, while the blue curves are for planets formed in discs dominated by centimetre-sized pebbles. All successful tracks are associated with formation regions comprised between 1 and 2 AU and have planetary cores of about 2 M_⊕. The core mass is identified by the mass value where the growth tracks intercept the pebble isolation mass curve (purple dotted line).