HR diagram showing the region where ν_max can be determined using eight hours of CHEOPS observations. Black points show the models used aligned in different evolutionary tracks. The evolutionary stage of these models are represented in different point transparency: MS stars in black, sub-giant dark gray, and giant in light gray. The orange line is the bottom limit for a potential detection of a star with Magnitude V = 6. The same bottom limit for the case of a star with V = 9 is shown with a red line. The blue line is the bottom limit for a V = 12 star. The green line represents the top limit for a correct coverage of the variability with eight hours of observational time.