two distances $r/r_M$, obtained from shower simulations with CORSIKA. Continuous curve - one primary proton shower with $10^{19}$ eV, dashed - average of 10 Fe $10^{16}$ eV showers, histogram - one Fe $10^{16}$ eV. $0<\varphi<20^{\circ}$ - bigger peaks, $160^{\circ}<\varphi<180^{\circ}$ - smaller peaks.[]{data-label="fig3"}](fig3N.eps){width="4.8in"}

![Distributions $f_{\theta}(\theta; \varphi,r/r_M,E,s)$ as in Fig. 3, but for angular directions perpendicular to $\vec r$. $70^{\circ}<\varphi<90^{\circ}$ - bigger peaks, $90^{\circ}<\varphi<110^{\circ}$ - smaller peaks.[]{data-label="fig4"}](fig4N.eps){width="4.8in"}

![Distributions $F_{\varphi}(\varphi;\chi,s)$ of the electron azimuth angle $\varphi$ for three electron energies $E$, at lateral distances $r/r_M$ that correspond to $\chi=7.8$ (upper graph) and $\chi=12.5$ (lower graph). Continuous curves - one proton shower with $E_0=10^{17}$ eV, dotted - iron shower with $E_0=10^{17}$ eV. $s=1$. Independence of $E$ and $r/r_M$ for constant $\chi$ is seen, as well as the universality with respect to the primary.[]{data-label="fig5"}](fig5N.eps){width="4.8in"}

![As in Fig. 5 but for $\chi=12.5$. Continuous curves - one primary proton shower with $E_0=10^{19}$ eV, dotted - average of 10 iron showers with $E_0=10^{17}$ eV. Upper graph: $s=0.7$, lower graph: $s=1.3$.[]{data-label="fig6"}](fig6N.eps){width="4.8in"}

The average curve from 10 iron showers with the primary energy $E_0 =10^{16}$ eV agrees very well with that referring to a single proton shower with $10^{19}$ eV. Comparing the average distribution with that for a single shower 