us note that $w$ is not used in this procedure. The values $A$=104 GeV$^3$ and $\Gamma =0.354$ GeV were obtained. The width of the in-medium peak is larger than the in-vacuum $\rho $-meson width equal to 150 MeV.

Thus the low mass spectrum at $M<m_{\rho }$ depends only on a single parameter $w$ which is determined by the relative role of Cherenkov effects and ordinary mechanism of resonance production. It is clearly seen from Eq. (\[ll\]) that the role of the second term in the brackets increases for smaller masses $M$. The excess spectrum in the mass region from 0.4 GeV to 0.75 GeV has been fitted by $w=0.19$. The slight downward shift about 40 MeV of the peak of the distribution compared with $m_{\rho }$ may be estimated from Eq. (\[ll\]) at these values of the parameters. This agrees with the above statement about small shift compared to $m_{\rho }$. The total mass spectrum (the dashed line) and its widened Breit-Wigner component (the solid line) according to Eq. (\[ll\]) with the chosen parameters are shown in Fig. 2. The overall description of experimental points seems quite satisfactory. The contribution of Cherenkov gluons (the excess of the dashed line over 