Cepheids exhibiting double bumps on the declining RV curve part stand out in the ϕ₄₁ vs. R₂₁ diagram as a “connecting band” between two otherwise parallel sequences. In ϕ₄₁ − ϕ₃₁ vs. R₂₁, double bump Cepheids also follow a significantly different trend. Plotting these parameters could serve to identify double bumps Cepheids in a quantitative manner rather than by visual inspection of the fits.