Peak bagging analysis of the simulated MS star 00664 by degrading the instrumental noise in the stellar PSD. Top panels: échelle diagrams obtained for three different noise levels, with same description as in Fig. 11. The folding Δν value is that by Ball et al. (2018). Bottom panels: five most central chunks of the stellar PSD as seen from GLOBAL, with similar description as in Fig. 6. The purple arrow marks the position of ν_max obtained from an independent background fit to each PSD.