Table 3 Spearman’s rank correlation coefficient between different distances on ${\mathcal{T}}_{\mathbf{6}}$

${\mathcal{T}}_{\mathit{6}}$

d _φ,2

${\mathit{d}}_{\mathbf{\text{nodal}}\mathbf{,}\mathbf{1}}^{\mathbf{\text{sp}}}$

${\mathit{d}}_{\mathbf{\text{nodal}}\mathbf{,}\mathbf{2}}^{\mathbf{\text{sp}}}$

d _RF