Histogram of effective temperature, T_eff, of the 2800 FGKM stars observed in the California Planet Search program, typically including 5–50 exposures for each star to detect Doppler variations. The distribution of T_eff spans the range of 3500–6500 K corresponding to early M-type stars to late F-type stars, in turn corresponding to stars with masses of 0.5–1.5 solar masses. This distribution is representative of the remaining 3300 stars, most of which were also observed for Doppler measurements to study exoplanets for which this range of T_eff is required. This search for laser emission was confined to this narrow range of stellar types.