Evolution is performed with the
BSSN scheme on an Adaptive Mesh Refinement (AMR) grid. Initially both
black holes are nonspinning and in a quasicircular orbit. The initial
binary is described by "puncture" initial data for nonspinning black
We consider two differing BHBH mass ratios: an equal mass case with mass ratio MBH:MBH = 1:1, and an unequal mass case with mass ratio MBH:MBH = 3:1. The total (ADM) initial mass of the system is labeled by M and its actual magnitude is arbitrary.