  It is shown that the model used in [1] for the description of the
experimental function $R_c (s)$ in the form of a sum of $\delta$-functions and
the plateau contradicts the Wilson operator expansion (O.E.) in the terms due
to the gluon condensate. A QCD model with an infinite number of vector mesons
[12,13] does satisfy the requirements of the O.E. for masses and electronic
widths resonances close to the experimental values. The region of allowable
values of the masses of $c$ and $b$-quarks and the gluon condensate compatible
with the O.E. is obtained (Figs. 2,3).
