Demonstration of the morphological spectrum extraction technique for example source G030.866+00.115. Left: the image depicts the BGPS V2 flux density on a linear scale from −0.10 to 1.40 Jy beam⁻¹. The blue contour is the Bolocat source outline, as described in Rosolowsky et al. (2010a), and the pink contour depicts the off-source region, one GRS resolution element in width, excluding pixels associated with the continuum sources above and to the lower right. Right: the filtered ¹³CO(1–0) spectra for this object. Blue and pink spectra represent the T_on(v) and T_off(v), respectively, while black represents T_source(v), used to estimate the v_LSR of the denser gas associated with the molecular cloud clump. The vertical green dashed line marks the HCO(3–2) v_LSR from S13.