Significance, as a function of the rest-frame velocity V_rest and the planetary semi-amplitude K_P, for the grid of models containing only water vapor (right panels) or methane (left panels). From the upper panels, we see that models with inverted T/P profiles (red bullets) do not describe the observations well; indeed they have a low significance and peak far away from V_rest ~ 0, where we would expect a signal of planetary origin. If however we restrict our analysis to the models which peak near V _rest ~ 0, we find three families of models that provide better agreement than others both for water vapor (10⁻⁵ < VMR(H₂O) < 10⁻³) and for methane (10⁻⁵ < VMR(CH₄) < 10⁻³). The different bullets shown in the bottom panels correspond to the different lapse rates used.