  The combined 3-channel analysis of experimental data on the coupled processes
$\pi\pi\to\pi\pi,K\bar{K},\eta\eta$ is carried out in the channel with the
vacuum quantum numbers. An approach, using only first principles (analyticity
and unitarity) and the uniformizing variable, is applied. Definite indications
of the QCD nature of the $f_0$ resonances below 1.9 GeV are obtained, among
them a surprising indication for $f_0(980)$ to be the $\eta\eta$ bound state.
An assignment of the scalar mesons below 1.9 GeV to lower nonets is proposed.
