4.1. For the three station profiles shown below, draw the bonjean curves in the space provided. Z station body lines Z bonjeans 6 6 5 4 [m] 3 2 a 1 5 4 [m] 3 2 1 0 0 1 2 3 4 5 0 [m] 110 20 30 40 [m] 60 60 50 50 A