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Fig. 3.

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Black hole formation efficiency ϵBH computed by Eq. (3) against the current mass of the cluster Mi normalized by the critical mass Mcrit (Eq. 1) for all observations and simulations (top); for observations and simulations of NSC, also including observations of UCD2 (middle); and for observations and simulations of GC, also including observations of UCD1 (bottom).

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