one can also see fluctuations in individual bins which are partly due to small electron numbers in the bins (see Section 4.3). We have verified that such universality of the distributions $f_{\theta} (\theta; \varphi , r / r_M , E , s )$ holds at every stage of the shower development in the range of $0.7< s <1.3$ . These angular distributions, when taken for the same values of energy and lateral distances of electrons (in units of Molière radius) do show dependence on the shower development stage.\

Extended (internal) universality of the angular distributions
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![Distributions of $F_{\xi} (\xi ; \varphi , s )$ for $s=0.7$ and $s=1.3$. Nine curves in each group refer to combinations of three energies and three lateral distances for each region of azimuth angle $\varphi$ (see text). Thick single curves correspond to distributions for all energies, distances and $\theta$ angles. One $10^{19}$ eV proton shower.[]{data-label="fig7"}](fig7aN.eps){width="3.8in"}

![Distributions of $F_{\xi} (\xi ; \varphi , s )$ for $s=0.7$ and $s=1.3$. Nine curves in each group refer to combinations of three energies and three lateral distances for each region of azimuth angle $\varphi$ (see text). Thick single curves correspond to distributions for all energies, distances and $\theta$ 