Minimum SNR required for a strong CO₂ detection at each bandpass center for the three highest CO₂ abundances that achieve strong detections. Venus-like is plotted in purple stars, Archean-like is plotted in light pink squares, and Proterozoic-like is plotted in magenta circles. The shaded regions represent the spaces in which you could achieve a strong detection for each abundance in their respective colors. The x-axis is bandpass center (μm) and the y-axis is SNR.