plot# PowerSpectralDensity.plot(display_in_dB=False, ref_value=1.0)# Plot the PSD. Parameters: display_in_dBbool, default: FalseParameter that specifies whether the PSD should be plotted in dB/Hz (True) or unit^2/Hz (False). ref_valuefloat, default: 1.0The reference value for the dB level computation. For an input acoustic signal, in Pa, the reference value should be 2e-5 (Pa).