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Top left: mode 3 occurs if V2max>V3max>V1max. Increase in V1max, so that V2max>V1max>V3max, leads to mode 4 (middle left). Further increase in V1max, so that V1max>V2max>V3max, leads to mode 2 (bottom left). Increase in V3max, so that V3max>V2max, leads to mode 1, regardless of whether V1max is high (bottom right) or low (top right).
