Mass versus period plots showing the surviving simulated planets from the pebble accretion scenario. Marker colour denotes the final water fraction of the surviving planets. Red markers denote the masses and periods of the observed Trappist-1 planets with error bars (Grimm et al. 2018). Left panel: mass versus period diagram for simulations where the potential effects of pebble ablation and their efficient recycling back into the disc is not included. Right panel: potential effects of pebble ablation and the efficient recycling of the envelope back into the disc (see Sect. 4.2).