Figure and caption adapted from \citet{PhysRevLett.116.061102}. 
The gravitational-wave event GW150914 observed by the LIGO Hanford (H1, left column panels) and Livingston (L1, right column panels) detectors. Times are shown relative to September 14, 2015 at 09:50:45 UTC. Top row, left: H1 strain. Top row, right: L1 strain. GW150914 arrived first at L1 and about 7 ms later at H1; for a visual comparison, the H1 data are also shown, shifted in time by this amount. Second row: Solid lines show a numerical relativity waveform for a system with parameters consistent with those recovered from GW150914