Optimization of the T_{A, thresh} for detection and R_T limit for multiply peaked spectra. Background color scale and gray dashed contours denote the number of BGPS V2 objects that possess both HCO(3–2) and morphologically extracted ¹³CO velocities (N_comp). White contours mark the fraction of N_comp whose v_LSR from the two sources agree to better than 5 km s⁻¹. Black contours show the fraction of N_comp whose morphologically extracted spectrum contains more than one peak above T_{A, thresh}. The white diamond indicates the chosen values of T_{A, thresh} and R_T while the gray diamonds are discarded choices (see text).