Fit residuals from the epochs (E₁ and E₂) used to estimate the impact on BW distances for all four Cepheids, cf. Table 1. For ℓ Car and RS Pup, both the cycle-to-cycle and longer timescales are shown. The earlier epoch is represented by green x markers, the later epoch by black open circles. For each epoch, the rms around the fit and median measurement uncertainty, ⟨ σ ⟩, are printed in the corresponding panel, indicating excellent fits.