A quadratic diameter taper optimizes current transfer in cables from any point
to the root (*Cuntz, Borst and Segev 2007, Theor Biol Med Model, 4:21*, see figure).
For different cable lengths, different parameter sets can be derived to fit
the quadratic equation with distance x:

y = P_{1}x^{2} + P_{2}x + P_{3}.

Each single triplet P corresponds to the best fit to a segment of a specific cable length
*l _{dend}*. In order to map a quadratic diameter to a full tree,
each path from terminal to the root is compared to its closest value
in a predetermined set of

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