Line-to-continuum for 12CO2 as function of abundance for different gas-to-dust ratios in solid lines. In the bottom plot the line-to-continuum for 13CO2Q-branch is shown in dashed lines. A dotted black line shows a line-to-continuum of 0.01, lines with this line-to-continuum ratio can be observed if the signal-to-noise (S/N) on the continuum is more than 300. With a S/N on the continuum of 300, observations of the Q-branch should be able to probe down to 10-9 in abundance for a gas-to-dust ratio of 1000. With similar gas-to-dust ratio and S/N, individual lines the 15 μm band will only be observable in disk with CO2 abundances higher than 3 × 10-8.
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