Creates an isotope biplot and provides a wrapper to ellipse...

This function loops over each posterior draw of a single group's
Bayesian bivariate ellipse and calculates the Standard Ellipse Area (SEA)
for each draw, thereby generating a distribution of SEA esimates. Not
intended for direct calling outside of `siberEllipses`

.

1 | ```
posteriorSEA(post)
``` |

`post` |
a matrix of postior covariance matrix and mean estimates for a
bivariate ellipse. In SIBER, this is typically one list element of the
object returned by |

A vector of posterior Bayesian Standard Ellipse Areas (SEA_B)

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