r	Radius
φ	Polar angle
a, n1, and n2	Parameters to be estimated
B	Oval maximum breadth
w	Distance of the maximum breadth of the oval from the y-axis
Dp	Diameter of the oval at a point L/4 from its pointed end
L	Oval length
RMSE	Root Mean Square Error—$\mathrm{R}\mathrm{M}\mathrm{S}\mathrm{E}= \sqrt{{\displaystyle \frac{{\displaystyle {\sum }_{i=1}^n}({{Predicted}_i-{Actual}_i)}^2}{n}}}$
R2	Coefficient of determination ${\mathrm{R}}^2={\displaystyle \frac{{(yi-\widehat{y})}^2}{{(yi-\overline{y})}^2}}$
CE	Circle–Ellipse model [21]
EE	Ellipse–Ellipse model reported herein
NORG	Model reported in [5]
PB	Preston–Biggins model