Sketch of a sliding-pattern model covering two consecutive radial modes, with angular degrees indicated. The parameter ν₀ gives the location of the reference radial mode, while Δν, δν₀₂, δν₀₁, δν₁₃ are indicated by arrows. The vertical dotted lines mark the oscillation mode frequency, while the vertical dot-dashed line is the midpoint between the two radial mode frequencies of the pattern. The parameter H₀ is indicated by a vertical gray arrow. The Gaussian envelope 𝒢(ν), rescaled by H₀, is shown by the double dot-dashed orange line, with its centroid ν_max indicated by the downward orange arrow. The horizontal dashed blue line is the background level estimated from the background fit. For illustration purposes, the rotational effect is not included (i.e., δν_rot = 0 or cos i = 1).