Table 1. Critical behaviours of the MST-DNM indicator I_t for different cases.

Case	Nodes	SDt	$\left|\Delta {\mathit{SD}}_{\mathit{t}}\left(\mathit{i}.\mathit{j}\right)\right|$	${\mathit{PCC}}_{\mathit{t}}\left(\mathit{i},\mathit{j}\right)$	$\left|\Delta {\mathit{PCC}}_{\mathit{t}}\left(\mathit{i},\mathit{j}\right)\right|$	${\mathit{W}}_{\mathit{t}}^{\mathit{k}}$	It
1	All DNM	↗	↗	↗	↗	↗	↗
2	DNM and non-DNM	D ↗	↗	D ↗	↗	↗	↗
		N →		N ↘	↗

Notes.

When the system moves from time point t − 1 to t, it is approaching the critical point.

“ ↗” represents the increase of variables; “ ↘” represents the decrease of variables; “ →” represents that there is no significant change in the variables.

“D” represents the DNM members; “N” represents the non-DNM members.

SD_t is the standard deviation at time point t; $PC{C}_t\left(i,j\right)$ is the Pearson’s correlation coefficient between two nodes v_i, v_j.