B values were computed at the point of connection between the soma and the dendrite indicated (e.g., the apical dendrite). Computations were performed assuming uniform R_m^u of 20,000 Ωcm²(third column) or 50,000 Ωcm² (fourth column). In both cases R_i = 200 Ωcm. For each dendrite B = (2/π) d₀^−3/2/R^*_in, where d₀ is the diameter of the dendrite at the connection point with the soma (fifth column), and R^*_in is the input resistance of the neuron at the soma when the dendrite is removed. The last column denotes the longest electrotonic path, from the soma to a dendritic terminal, for the uniform case (R_m^u = 20,000 Ωcm²).