Element absorption in the 0.75 Å passband of all the transitions approved by QT, for selected elements in HD 209458b. (Upper left: Ca I, Upper right: Mn I, bottom left: Sc II, bottom right: V II). The ordinate shows (−C_IO)∕Σ_noise where Σ_noise = max(Σ_II, Σ_OO). The color shows the detection significance (−C_IO∕Σ_IO), where green is ≥3σ and red is ≤1σ. Additionally, to deal with contamination from transitions of other species closer than 1 × FWHM, we show the ones without contamination as circles (•), with the strongest oscillator strength at that element as triangles pointing up (▴). Both types are considered strong transitions (ST). Otherwise, we show them as triangles pointing down (▾), and considered them as weak transitions.