Frequency differences between a stellar model calibrated to the F3 simulation, and the patched model, in which the near-surface layers were replaced by the averaged simulation profile. Additional curves show the parametric fits of the one-term correction by Ball & Gizon (2014; dashed), their two-term fit (dotted), a power law (dot-dot-dashed), the modified Lorentzian of Sonoi et al. (2015; long-dashed), and a scaled solar correction (dot-dashed). The two-term fit is clearly better able to capture the distinct shape of the frequency difference.