Left panel: a χ2 minimized fit of the CO ladder of Arp 299 A from J = 1−0 through 24–23. The fit was constrained to three PDR models, displayed in blue, green, and yellow. The black points are the observed CO fluxes and the red line is the total model fit. Right panel: the same models as the left panel, but the fits for the 13CO and HCN fluxes. The HCN model lies far above the observed J = 3−2 and 4–3 HCN fluxes.
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