found in Appendix \[appB\], here we provide only brief summary.

The simplest case is the correlation function having just one extremum, it has to be a minimum having depth $-1< c_{\rm min}<0$. It turns out that the critical value $\varkappa_c$ is a universal function of $c_{\rm min}$ $$\label{uni1}
   \varkappa_c=\frac{1}{1-c_{\rm min}}$$ and does not depend on all other details of $c(x)$, even on the functional form of $c(x)$. In fact, this is true even for $c(x)$ having several extrema if we use the deepest minimum and for all positive maxima $c(x_{\rm max}) <|c_{\rm min}|$ (see Fig. \[uni\]). If $c(x)$ has an additional positive maximum with height $c_{\rm max} > |c_{\rm min}|$, then the behavior of $\varkappa_c$ is dominated by this maximum but it is a non-universal one.

![Universal dependence of $\varkappa_c$ on the minimal value $c_{\rm min}$ of the correlation function $c(x)$ in the case where $c(x)$ has a minimum with $c_{\rm min} <0 $. Points are results of the numerical calculation of $\varkappa_c$ for $\det\textbf{T}$ (filled squares for the function $c(x)=\left(1-x/x_0\right)/\left[1+s(x/x_0)^2\right]$, and empty squares for $c(x)=\exp(-x/x_0)\cos(ax/x_0)$ for various values of $s$ and $a$), while the solid line corresponds to . For the second correlation function we considere the deepest (first) 