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Receptor potentials generated with model parameters varied by the factor 10 up (squares) and down (circles). In a and b the uptake was varied around 1 μM/s (dots), it was always 1 μM/s in c–l. The stimulus duration was 2 s. The models N and R may respond differently to variation of a specific parameter. In some cases two parameters are specified if their variations produced indistinguishable effects
