Figure 11: This figure shows the irreducible masses ( ) of individual and common
apparent horizons in a binary black hole collision, as calculated by two different apparent horizon
finders in the Cactus toolkit, AHFinder and AHFinderDirect. (AHFinderDirect was also
run in simulations at several different resolutions.) Notice that when both apparent horizon finders
are run in the same simulation (resolution ), there are only small differences between
their results. Figure reprinted with permission from [5]. © 2005 by the American Physical Society.
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