The four panels show the gravitational wave amplitudes (top) and spectrograms of dE_M/dν (bottom; normalized to the absolute maximum) arising from non-spherical mass flow of models W15-2 (top left), W15-4 (top right), L15-2 (bottom left), and L15-3 (bottom right), respectively. Blue curves give the amplitude A₊ at the pole (solid) and the equator (dotted), while red curves show the other independent mode of polarization A_× from the same directions.