plot_insertion_losses# TouchstoneData.plot_insertion_losses(threshold=-3, plot=True)# Plot all insertion losses. The first frequency point is used to determine whether two ports are shorted. Parameters: thresholdfloat, int, optionalThreshold to determine shorted ports in dB. Default value is 3. plotbool, optionalWhether to plot. The default is True. Returns: listList of tuples representing insertion loss excitations.