Upper left: rotation diagram for the CO lines. Blue dots: SEST observations from the literature, red dots: SPIRE data, green dot: SPIRE CO line blended with a water line. The full, dashed, and dotted lines show different single temperature RADEX models. Upper right: two temperature (RADEX) fits to the CO lines. One extended cold component (blue) with n(H₂) = 7 × 10³ cm⁻³ and N(CO) = 1 × 10¹⁷ cm⁻², and one hot component (red) from more compact regions n(H₂) = 10⁴ cm⁻³ and N(CO) = 4 × 10¹⁵ cm⁻². Lower left: a model consisting of a slightly warmer extended component with RADEX values of n(H₂) = 7 × 10³ cm⁻³ and N(CO) = 7 × 10¹⁶ cm⁻² (blue), and a slow velocity C-type shock with a shock speed of 10 km s⁻¹ and a pre-shock density of n(H + 2H₂) = 2 × 10⁴ cm⁻³ (red). The C-shock model comes from Flower & Pineau des Forêts (2010) where we have scaled their values to a 10″-source in order to obtain a best fit. Lower right: water lines modeling. Water emission lines observed by SPIRE – blue dots: o-H₂O, green arrow: blended ortho-line, red dots: p-H₂O. The same slow-velocity C-type shock as for CO but the model with a shock velocity of 10 km s⁻¹ and a pre-shock density of n(H + 2H₂) = 2 × 10⁴ cm⁻³ underestimates the line intensities. Increasing the speed or the pre-shock density will give a better fit but it’s still hard to fit all para lines.