Density (and its contours) of the bivariate t distribution with a degrees of freedom, mean vector b and covariance matrix c.

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`x` |
vector of quantities |

`y` |
vector of quantities |

`a` |
degrees of freedom. Must be strictly positive. |

`b` |
mean vector (2x1) |

`c` |
covariance matrix. Must be a positive definite 2x2 matrix. |

`p` |
probability |

`...` |
Arguments to be passed to the plot function when plotting contours |

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