Panels a and b: inferences of damping ratio and power ratio at foot-points using CoMP data for average power ratio at different frequencies (triangles). The red and green dots are the maximum a posteriori estimates with uncertainty at the 68% credible interval (purple bars). Panel a: the inference is restricted to ⟨P(f)⟩_ratio >  1.2. Panel b: the horizontal dashed line is at ⟨P(f)⟩_ratio = 1. Panel c: estimates of fractional contribution from power ratio at foot-points, F_R0, and absolute contribution from resonant damping, F_exp.