Evolution of the pebble component of the disc. Right: total dust mass (including that which has crossed the inner disc boundary and accreted onto the star) inside the initial locations of the H₂O (solid) and CO₂ (dashed) snow lines (right). Left: Pebble flux across the H₂O snow line. Included for reference are the values from Table 6 of Romero-Mirza et al. (2024a) [RM24], which are estimated from the total number of H₂O molecules <400 K, split into compact discs (small, filled, markers) and extended discs (larger, ringed, markers).