Table 4 Signs of slopes of ${\mathit{E}}_{\mathbf{1}}$ and ${\mathit{E}}_{\mathbf{2}}$ in $\mathcal{B}$ when ${\mathit{C}}_{\mathbf{1}}\mathbf{>}\mathbf{0}$ or ${\mathit{B}}_{\mathbf{2}}\mathbf{>}\mathbf{0}$

${\mathit{B}}_{\mathit{i}}{\mathit{\gamma }}_{\mathit{i}}\mathbf{-}{\mathit{C}}_{\mathit{i}}{\mathit{\beta }}_{\mathit{i}}$, i = 1,2

${\mathit{B}}_{\mathit{i}}{\mathit{\alpha }}_{\mathit{i}}\mathbf{-}{\mathit{A}}_{\mathit{i}}{\mathit{\beta }}_{\mathit{i}}$, i = 1,2

${\mathit{C}}_{\mathit{i}}{\mathit{\alpha }}_{\mathit{i}}\mathbf{-}{\mathit{A}}_{\mathit{i}}{\mathit{\gamma }}_{\mathit{i}}$, i = 1,2

Slope of ${\mathit{E}}_{\mathbf{1}}$

Slope of ${\mathit{E}}_{\mathbf{2}}$