  We reanalyze the scaling properties of inclusive quasielastic electron
scattering from $^{12}$C by subtracting from the data the effects of
two-particle emission. A model of relativistic meson-exchange currents (MEC) is
employed within the mean field theory of nuclear matter, with scalar and vector
potentials that induce an effective mass and a vector energy to the nucleons. A
new phenomenological quasielastic scaling function is extracted from a
selection of the data after the subtraction of the 2p-2h contribution. The
resulting superscaling approach with relativistic effective mass (SuSAM*) can
be used to compute the genuine quasielastic cross section without contamination
of the 2p-2h channel that can then be added separately to obtain the total
quasielastic plus two-nucleon emission response.
