<1$ (because of the superlinear growth of the integral (\[lin\]), mechanism I). The solid line in Fig. \[kappa-power-law\] shows numerically calculated critical values $\varkappa_c(n)$, and for a given $n$ $\det \textbf{T}$ is nonpositive for $\varkappa >\varkappa_c(n)$. We define $\varkappa_c$ as a minimal $\varkappa$ for which the equation $$\det \textbf{T}=0
\label{det0}$$ is valid for some $(x,y,z)$. Above the critical line $D$ does not exist because of the divergence of $Z_4(x,y,z)$ (mechanism II). The domain 1 is the region where long time charge transport demonstrates well-defined average velocity $v$ and diffusivity $D$. Above that line in the domain 2 the diffusion of the carriers is anomalous one, though the average velocity still exists. Formally, the line $\varkappa=\varkappa_c(n)$ may be extended to the region $n<1/2$ (it is shown as a broken line here), thus separating this region into two parts, domain 3 and 4. Exact dynamics of the carriers’ packet spreading in domains 2-4 and to what extent they differ from one another are the open problems. The very possibility to subdivide the region to the left of the vertical line $n=1/2$ into two domains is problematic.

![Dependence of the numerically calculated critical $\varkappa_c$ on $n$ for the correlation function $c(x)=\exp\left[-(x/a)^n\right]$ (solid line). 