  The estimates of the gluon concentrations in the classical SU(3)-Yang-Mills
field modelling confinement are given for the first three states of charmonium
whose spectrum is tuned by calculating electromagnetic transitions among the
mentioned levels in dipole approximation. For comparison the corresponding
estimates for the photon concentration in the ground state of positronium
(parapositronium and orthopositronium) are also adduced.
