Outflow forces (for the combined blue and red outflow lobes) (M_⊙ km s⁻¹ yr⁻¹) versus L_bol (L_⊙) (top panel) and T_bol (K) (bottom panel) calculated using the CO J = 3–2 transition and assuming an excitation temperature of 75 K for the PBRs analyzed in this paper (red squares). The Class 0 source HOPS 340 and Class I source HOPS 223 are not shown. The outflow forces calculated using the same transition and excitation temperature by Yildiz et al. (2015) for a sample of Class 0 protostars (blue circles) and Class I protostars (cyan circles). The green triangles are the 1-σ upper limits for the PBRs with no detected outflow emission. The diamonds represent the median values of each sample: Class 0 protostars from Yildiz et al. (2015) (blue), Class I protostars from Yildiz et al. (2015) (cyan), and the protostars studied in this paper (red).