NPIPE E-mode transfer functions, measured by comparing simulated CMB input and foreground-cleaned output maps over 60% of the sky. The 30 and 353 GHz frequencies are not expected to have a measurable transfer function because they are not calibrated with a polarization prior. These two transfer functions are merely of diagnostic value (to demonstrate the absence of signal suppression) and are not applied in any analysis. The error bars reflect the statistical uncertainty of the measured transfer function, not the total Monte Carlo scatter. Tabulated values of the transfer functions are listed in Table G.1.