Upper mass limits of planets from TROY project I, II, III, and this work (ExoEcho). The x-axis displays planet names, and the y-axis presents mass limits on a logarithmic scale. The colors and markers distinguish each study. The red triangles represent our results assuming a libration amplitude of ∼15°. The error bars indicate the 1σ uncertainty, which is omitted when smaller than 15% of the mass limit for visual clarity. For systems where the lower 1σ boundary is unconstrained (i.e., consistent with zero mass), we represent the limit using a vertical line extending to the bottom of the axis.