Noted. The overlapping colors of PAS 1-3 was not showing well and also the support level for Pas 4 & 5 was not indicated. Thats why it was confusing.Mate, thats your problem you can not read the graph! Nothing complicated, even basic school student would understand. On x is leg input power, on y is motor output power. I have tried to help...
And if you not ok with "human power multiplication", you would need to write to Bosch for explanation, as they using this term also!