  Recent polarization transfer measurements of the proton electromagnetic form
factors yield very different results from previous Rosenbluth extractions. This
inconsistency implies uncertainties in our knowledge of the form factors and
raises questions about how to best combine data from these two techniques. If
the discrepancy is due to missing correction to the cross section data, as has
been suggested, then different applications will require the use of different
form factors. We present two extractions of the form factors: a global fit to
the world's cross section data, and a combined extraction from polarization
transfer and cross section data. The former provides a parametrization of the
elastic electron-proton cross section, while the latter provides a consistent
extraction of the underlying form factors, under the assumption that missing
terms in the radiative correction explain the difference between the cross
section and polarization transfer results.
