Detectability maps obtained from injection-recovery tests, showing upper limits on the abundances of the main near-infrared strongest absorbers in the atmosphere of G 1214 b. Specifically, we investigate H₂O (left panel), CH₄ (middle panel), and CO₂ (right panel) across a range of metallicities and cloud deck altitudes. Dashed lines indicate the S/N = 5 contours for H₂O, CH₄, and CO₂, as obtained from CRIRES⁺ (white, eight transits combined). The lower S/N of CO₂ recoveries stems from its weaker and fewer lines in the K band, compared to the other infrared absorbers. Red dotted lines indicate the upper limits derived in Kempton et al. (2023) from day and nightside evidences of H₂O observed with JWST, in the best-fitting case of reflective clouds and high metallicity.