Ridge curves of U (maximum amplitudes over all frequency range). Red: normalized experimental data. Blue: numerical integration of the equations with parameters identified by HBM. Green: numerical integration with parameters identified by CX-A. Continuous black: numerical integration with parameters determined experimentally at low excitation amplitude. Dashed black: numerical intergration with the mean parameters determined by HBM inside the pumping zone. Configuration 1: h_m = 0.23 mm, R_m = 5 cm, f_m = 45 Hz.