Correction to: Scientific Reports https://doi.org/10.1038/s41598-017-14593-5, published online 26 October 2017

This Article contains errors in Equation 1.

\(V=\frac{\pi {a}^{3}{(1+\cos \theta )}^{2}(2\,-\,\cos \,\theta )}{3{\sin }^{3}\theta }\)

should read:

\(V=\frac{\pi {a}^{3}{(1-\cos \theta )}^{2}(2\,+\,\cos \,\theta )}{3{\sin }^{3}\theta }\)