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, 80 modes share the highest displayed RTP of 96.7%: b 000 102 s10000 c0, b 000 102 s10000 c1, and b 000 150 s10000 c0 and 77 more. 80 modes share the lowest displayed RTP of 96.7%: b 000 102 s10000 c0, b 000 102 s10000 c1, and b 000 150 s10000 c0 and 77 more. The difference between the displayed extremes is 0 percentage points.