The probability distribution of ν_max for observed and model-predicted oscillating giants. The shaded region denotes the 16 and 84 percentile Poisson uncertainty around the observed data. The black dashed line, ν_max = 30.5 |$\mu$|Hz, shows the approximate location of the peak in the distribution of the model-predicted stars. The peak corresponds to the location of the RC giants. Panel (q) shows the same distributions for Kepler. Panel (r) shows the combined data from all K2 campaigns. The observed peak is systematically lower compared to the predictions, except for C4 and C13, which point towards the anticentre direction.