to usual electromagnetic values for gases close to 1. If interpreted in terms of the Breit-Wigner resonances, as explained below, it results in the large density of partons in the created quark-gluon system with about 20 partons within the volume of a single nucleon [@6]. It agrees with its estimates from $v_2$ and hydrodynamics. This value is also related to the energy loss of gluons estimated in [@6] as $dE/dx\approx 1$ GeV/fm. The height of the peaks determines the width of the ring which in its turn defines the free path length of Cherenkov gluons [@6] which happens to be long enough $R_f\sim 7$ fm. Thus they hadronize, probably, close to the surface of the initial volume.

These estimates are obtained [@6] as follows. If the hadronization of gluons is a soft process then the gluon energy closely corresponds to the energy of the produced resonance. It implies that in this particular experiment Cherenkov gluons can be emitted only with energies within the lower wings of hadronic resonances. Their amplitude is of the Breit-Wigner shape. For a single resonance at energy $E_R$ and with width $\Gamma _R$ one gets $${\rm Re} n(E)=1+\frac {2J+1}{(2s_1+1)(2s_2+1)}\cdot \frac {6\mu ^3\Gamma _R\nu }
{E_R^2}\cdot \frac{E_R-E}{E[(E-E_R)^2+\Gamma 