Response curves butterfly filtering in LIGO O2

<p>Response curves in butterfly filtering to descending chirps in LIGO O2, calibrating output of chi-image analysis of merged (H1,L1)-spectrograms&nbsp;versus injection energies in Extended Emission to GW170817 (distance of 40Mpc). Response curves&nbsp;are shown for characteristic time-scales of frequency descent over 0.5-4.5 seconds for injection energies 0-8%MSolar c2. Results are averaged following times slides -10ms &lt; Delta t &lt; 10ms (light travel-time between the LIGO H1 and L1 detectors) and over three injection sites (one shown in first movie, closest to GW170817EE;&nbsp;all three shown in second movie).&nbsp;</p>