save_data PSD file saves the ASD

In this line of save_data, it saves a file: '{}/{}_{}_psd.dat'.format(outdir, self.name, label), but the np.savetxt saves self.amplitude_spectral_density_array. I think either the above file should be called '{}/{}_{}_asd.dat'.format(outdir, self.name, label) or the savetxt line should save self.power_spectral_density_array.