This function returns the Hillman taper
Hillman taper: given a branch it computes ratio between the final diameter and
the initial one.

The segment taper is calculated as Dc/
Da
| Metric | Total_Sum | #Compartments (considered) |
#Compartments (discarded) |
Minimum | Average | Maximum | S.D |
| Taper_2 | 10.7164 | 85 | (1017) | -0.333 | 0.126 | 0.8636 | 0.2235 |
The above example returns the total sum of the Taper_2 of each compartment, minimum, average and maximum values according to standard output of Lmeasure.