Extended Data Fig. 4: Equal branching of current in all arms at ν = 5/2.

Current is sourced from the source, S, and measured in the drain, D, in the same arm (see Fig. 1a). The blue curve shows the reflection coefficient of the current measured in the drain as a function of the pinching of the arm gate. The reflection coefficient value starts from 0.25, when all the arm gates are fully open, and reaches 1.00, when all the current is reflected. The red, green and magenta curves correspond to measurements for the fully open ‘measurement arm’, performed while the other arm gates deplete gradually one by one. Four open arms give a reflection coefficient of r = 0.25, whereas three open arms lead to r = 0.33 and two open arms give r = 0.50. The dotted lines are guides for the eyes indicating equal branching of currents.