Fig. 2:

Relationship of ${\hat{R}}^{+}\left({\mu }_k,{\text{y}}_k,{\mathrm{\Theta }}^{+}\right)$ and ${\hat{R}}^{-}\left({\mu }_k,{\text{y}}_k,{\mathrm{\Theta }}^{-}\right)$ with μ_k and y_k.