**Figure 6. **Correlation analysis. **A**: There is a perfect correlation between the reciprocal of the average cell area and cell density (because there were no extracellular
gaps, spaces, or atrophic regions between cells). **B**: There is a strong negative correlation between average form factor and average eccentricity, confirming integrity of our
data set. **C**: There were positive correlations between the average cell area and average eccentricity. **D**: There were positive correlations between cell density and average form factor. **E**: Negative correlations exist between the average cell area and the form factor. **F**: Negative correlations exist between the cell density and average eccentricity.