Global seismic parameters as a function of ν_max derived from the five methods used here. a) FWHM δν_env of the Gaussian envelope; b) Mode height H_νmax, as defined by Eq. (1), corrected for apodization; c) Background at ν_max. The increase above 200 μHz is an artefact due to the proximity of the Nyquist frequency. d) Height-to-background ratio, affected by the artefact on B_νmax. The color code indicates the method used for the data analysis, as indicated in panel a). The deviations from the trends above 200 μHz are due to the proximity to the Nyquist frequency.