the data from Ref. [@Bernheim82]. Only for the NIKHEF experiment [@vdSteenhoven88a] was it possible to resolve the lowest three $1p$ fragments. Although there are small differences between the missing momentum distributions for these three fragments, the ground state represents about $81\%$ and the next $1p_{3/2}$ fragment an additional $9\%$ of the total $1p$ strength for $E_m < 25$ MeV. Therefore, we represent the $1p$ strength using either a single Dirac-Hartree wave function for $1p_{3/2}$ or the NIKHEF fit to the ground state. That experiment was also able to resolve several weak positive-parity states with $E_m < 30$ MeV, but their strength is small enough to neglect in the present analysis [@vdSteenhoven88b]. For most other experiments the lowest missing energy bin contains a small contribution from the low-energy tail of the $1s$ shell. Furthermore, for all experiments the bin intended to emphasize the $1s$ shell inevitably contains contributions from a broad continuum that may include additional $1p$ strength. Therefore, each $E_m$ bin will be fit as an incoherent mixture of $1p$ and $1s$ contributions according to $$\label{eq:mixture}
\sigma_\text{red} = 
N_{1p} \sigma_\text{red}(1p_{3/2}) +  N_{1s} \sigma_\text{red}(1s_{1/2})$$ where the overlap function for each shell is assumed to be independent of missing energy and is 