of data for $^{12}$C$(e,e^\prime p)$. $E_0$ is the beam energy and $T_p$ is the central proton kinetic energy. Quasiperpendicular kinematics with constant $(\omega,\bm{q})$ were used unless a $Q^2$ range is given. \[table:data\]

Effective momentum approximation {#sec:EMA}
================================

Figure \[fig:12Cpm\] compares momentum distributions for the relativistic HS and NLSH models with the Woods-Saxon models used by Lapikás [[*et al.* ]{}]{}[@Lapikas00] and by Dutta [[*et al.* ]{}]{}[@Dutta03]. The latter were based upon a NRDWIA analysis of the Saclay data for $T_p = 99$ MeV made by Bernheim [[*et al.* ]{}]{}[@Bernheim82]. The differences between the HS and NLSH wave functions are relatively small, but the NIKHEF $1p$ wave function has a much stronger peak and declines more rapidly with respect to $p_m$. Similarly, the NIKHEF $1s$ wave function starts higher and falls faster than the relativistic wave functions. Interestingly, the Saclay wave functions show similar behavior but the effects, compared with the NIKHEF wave functions, are smaller for the $1p$ and larger for the $1s$ wave function. The large spread among these momentum distributions will obviously be reflected in the corresponding DWIA calculations.

![(Color online) Momentum distribution for $^{12}$C$(e,e^\prime p)$. []{data-label="fig:12Cpm"}](pmiss.ps){width="3.0in"}

To evaluate the effect of variations of $\rho(p_m)$ upon DWIA calculations using 