Comparison of rotational and ro-vibrational line emission for several apertures. Top: integrated flux for the H₂0–0 S(5) line and the H₂1–0 S(5) line as titled. The H₂1–0 S(5) flux image has been convolved to the PSF at the H₂0–0 S(5) line. The original PSF for H₂1–0 S(5) and the post-convolution PSF are the white and black filled circles in the H₂1–0 S(5) plot, respectively. Bottom: ratio of 1–0 to 0–0 line fluxes for the apertures shown in the top image.