acceptance. Alternatively, problems in the reaction model may lead to systematic underestimation of spectroscopic factors. Most of the data contributing to the aforementioned estimate of $65\%$ IPSM were limited to $T_p < 100$ MeV and were analyzed using NRDWIA calculations based upon empirical Woods-Saxon wave functions. More recent relativistic analyses (RDWIA) typically produce larger spectroscopic factors [@Udias95] and describe interference response functions more accurately [@Kelly99b; @Udias99; @Udias00]. The effects due to dynamical enhancement of Dirac spinors by the nuclear mean field are actually stronger at low $Q^2$ than at higher energies [@Kelly05a].

While spectroscopic factors are of obvious importance to theories of nuclear structure, they also affect analyses of nuclear transparency that look for the onset of color transparency [@Dutta03; @Garrow02]. Those experiments typically compare the $(e,e^\prime p)$ yield integrated over wide but finite ranges of missing momentum, $p_m$, and missing energy, $E_m$, with calculations based upon a model spectral function. This spectral function is usually based upon the IPSM with a correction factor for the depletion by correlations of the single-hole strength within the experimental acceptance. Therefore, the accuracy of the depletion factor affects the accuracy of transparency measurements.

Recently Lapikás [[*et al.* ]{}]{}[@Lapikas00] analyzed the data for $^{12}$C$(e,e^\prime 