Figure 6. The critical chemical potential (left) with z = 1 (black solid), $\tfrac{3}{2}$ (red dashes), 2 (blue dots and dashes), and $\tfrac{5}{2}$ (purple dots) and the grand potential (right) with $z=\tfrac{5}{2}$ for $\gamma =-\tfrac{3}{50}$ (black solid), 0 (red dashes), $\tfrac{2}{50}$ (blue dots and dashes) and the normal state (horizontal dashes), where $\kappa ={\left(\tfrac{4}{3+z}\right)}^{1/z}$.