Week 6 & 956053000 & 956657800 & Apr 23-30, 2010\
Week 7 & 961053000 & 961657800 & Jun 20-27, 2010\
Week 8 & 966053000 & 966657800 & Aug 17-24, 2010\
Week 9 & 971053000 & 971657800 & Oct 14-21, 2010\

An alternate data selection scheme [@S6CasAFriends; @S5CasA], which takes detector duty cycle into account is to maximize the figure of merit

$$\label{FOM}
\sum_{k,f} \frac{1}{S_h(f)}$$

where $S_h(f)$ represents the strain noise power spectral density at frequency $f$ in the $k^{th}$ , and the sum is taken across all frequencies $f$ in the search band and all SFTs in a given 9.2-day (see Sec. \[s:SPS\] below) observation time. The format is science-mode detector data split into 1800s segments, band-pass filtered from 40–2035 Hz, Tukey windowed in the time domain, and Fourier transformed. This method favored a different data stretch: July 24–August 2, 2010 (GPS 964007133 – 964803598). This second data stretch had slightly worse average sensitivity than the first, but a higher detector livetime: our first (October) data set contained 374 SFTs (202 from Hanford and 172 from Livingston) with average sensitivity $h_{sens}^{200\textup{Hz}} = 1.92 \times 10^{-23}$; the second (July-August) data set contained 642 SFTs (368 from Hanford and 274 from Livingston) 