Figure 4 – Consistency evaluation of the Effective Catchment Index (ECI) by using the Budyko framework. The blue dashed lines show the upper (Q = 0) and lower (Q = P) water limits while the red dashed line indicates the energy limit. The black line is the Fu curve w = 2.6, and the gray shade covers the feasible range around the Budyko curve with 90% of confidence of the w parameter.