A coalescing equal-mass black hole binary, each with a mass of 3.5 solar masses, as it could be heard by the ground-based detectors like LIGO and VIRGO. The signal includes not only the inspiral but also the merger of the two black holes. Simulated instrumental noise has been added to the signal. Notice that the signals are much easier to hear in the simulated space data than in this ground-based data, because the long arms of the space detector greatly increase its sensitivity.