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Panel (a) [(b)] is the plot of the real [imaginary] part of the band structure with b = (0, 0.5, 0.5) and d = (k x , k y , 0). Red points indicate EPs. Panel (c) [(d)] is the plot of the real [imaginary] part of the band structure with b = (0, 0, 0.5) and d = (k x , k y , 0). Red lines indicate the SPER.
