Upper bound L(rho) = q * sqrt(rho^(2n) sigma_nu^2 + sigma_eps^2) of the
level-level confidence interval [-L(rho), L(rho)] of Z,
with q the (1+level)/2 quantile of the standard normal. The
interval is symmetric, so this single value gives both bounds.
See also
dominoise-package paper's Definition 4