Échelle diagrams for the MS stars KIC 12069424 and the simulated one 06550. The colored symbols represent the frequencies extracted by CHUNK for angular degrees ℓ = 0, 1, 2, 3 (see legend), with their associated 1-σ uncertainties, while the colored horizontal bars indicate the literature values varied by ±1 FWHM of each peak, with the centroid marked by a vertical tick. For KIC 12069424, the adopted literature FWHM are the same for all the angular degrees within a single radial order, as provided by Lund et al. (2017). The numbers on the left side of each panel indicate the radial order n of the corresponding radial mode as obtained by FAMED. The folding value of Δν is Δν₀ obtained from GLOBAL for the real star, and the one computed by Ball et al. (2018) for the simulated one. The x-axis range is adjusted to have the ℓ = 2, 0 ridges appearing on the left side.