Visualization of topological connectivity and optimal cutoff distance of Gaussian network model for protein 1GVD. The left charts from a to h are barcodes generated based on the filtration given in Eq. (25). From a to h, the cutoff distances used are 3Å, 4Å, 5Å, 6Å, 7Å, 9Å, 11Å, and 13Å, respectively. The right chart is the correlation coefficient obtained from the Gaussian network model under different cutoff distance (Å).