Bivariate normal distribution of two standard normal variables with
correlation coefficient @var{rho}. Two variates @var{x0} and @var{x1}
must be provided. Constraints: 0 <= @var{rho} <= 1, 0 <= @var{p} <= 1.
Bivariate normal distribution of two standard normal variables with
correlation coefficient @var{rho}. Two variates @var{x0} and @var{x1}
must be provided. Constraints: 0 <= @var{rho} <= 1, 0 <= @var{p} <= 1.