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The ZDMs exist for all harmonic indices $l$ and $m \\ge 0$, and their frequencies cluster onto the real axis in the extremal limit. The DMs have nonzero damping for all black hole spins; they exist for all counterrotating modes ($m<0$) and for corotating modes with $0\\leq \\mu\\lesssim \\mu_c=0.74$ (in the eikonal limit), where $\\mu\\equiv m/(l+1/2)$. 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