Figure 15. Compilation of results for the axial dipole mass M A from experiment (A-J) and lattice simulations (K-R). Extractions based on a dipole ansatz are colored red, while those using any variant of the z -expansion are colored blue. The error bands show the results of our !2P (red) and our ! z 4+3 (blue) (cid:12)ts, with all errors added in quadrature. Symbols: crosses: (cid:23) scattering; circles: (cid:25) electroproduction; tic: not continuum extrapolated; dot: single ensemble; square: continuum extrap- olated. Abbreviations: RFG: relativistic Fermi gas [127]; LFG: local Fermi gas; RPA: random phase approximation [128{130]; DWF: domain wall fermions; HISQ: highly improved staggered quarks; CE: continuum