Line proflies created by averaging a selection of high quality low (bottom) and high-J (top) HCN lines toward MonR2 IRS 3A. J in this case is J_upper and the high energy lines are chosen as those with J ≥ 5, shown in blue, and the low energy lines are those with J ≤ 4, shown in orange. The vertical dashed line denotes the cloud velocity of 10 km s⁻¹ (van der Tak et al. 2003). Panel a shows fits to the average line profiles given in black and individual contributions to the fit as blue dotted lines. Panel b shows fits to the average line profiles with the contribution at 9 km s⁻¹ subtracted out.