Minimum SNR required to achieve a strong CO₂ detection at each bandpass center for four varying planetary archetypes: (a) low CH₄ and low H₂O, (b) low CH₄ and high H₂O, (c) high CH₄ and low H₂O, and (d) high CH₄ and high H₂O. The bandpass center is plotted on the x-axis, spanning 1.05–1.68 μm, and the SNR is plotted on the y-axis. Varying abundances are plotted in different colors and shapes: Venus-like in light purple stars, Archean-like in light pink squares, and Proterozoic-like in dark pink circles. The relative shading corresponds to any area CO₂ is strongly detected and matches colors with the respective CO₂ abundance.