  We study interference patterns in the $\phi\to(\gamma
a_0+\pi^0\rho)\to\gamma\pi\eta$ and $\phi\to(\gamma f_0+\pi^0\rho)\to\gamma
\pi^0\pi^0$ reactions. Taking into account the interference, we fit the
experimental data and show that the background reaction does not distort the
$\pi^0\eta$ spectrum in the decay $\phi\to\gamma\pi\eta$ everywhere over the
energy region and does not distort the $\pi^0\pi^0$ spectrum in the decay
$\phi\to\gamma\pi^0\pi^0$ in the wide region of the $\pi^0\pi^0$ system
invariant mass, $m_{\pi\pi}>670$ MeV, or when the photon energy is less than
300 MeV. We discuss the details of the scalar meson production in the radiative
decays and note that there are reasonable arguments in favor of the one-loop
mechanism $\phi\to K^+K^-\to\gamma a_0$ and $\phi\to K^+K^-\to\gamma f_0$. We
discuss also distinctions between the four-quark, molecular, and two-quark
models and argue that the Novosibirsk data give evidence in favor of the
four-quark nature of the scalar $a_0(980)$ and $f_0(980)$ mesons.
