Figure 4:

Visualization of physiological and biological biomarkers relationships a) in edge-based and vertex-based representations and b) by the corresponding $CIG$. In the $CIG$ representation, directed edges connect the nodes that appear sooner to the nodes that appear later (subject to the other conditions of $CIG$ construction). In cases where both nodes appear at the same time, we could connect the nodes with lexicographically smaller labels to the nodes with larger labels and follow an identical approach for all the $CIG\mathrm{s}$ created in the data set.