The catalogue does not identify a separate base return. RTP Ledger leaves the base return unknown. Use the mode table for the published values.
At the two-decimal display precision, 793 modes share the highest displayed RTP of 96.05%: combined over 001, combined over 002, and combined over 003 and 790 more. 793 modes share the lowest displayed RTP of 96.05%: combined over 001, combined over 002, and combined over 003 and 790 more. The difference between the displayed extremes is 0 percentage points.