You can use the Quick Views from the Chart Menu to run ad-hoc analysis of the chart.
Done Activities
A heatmap for contact's completed CRM tasks & e-mails sent.
Open Activities
A heatmap for contact's planned CRM tasks.
Over Due Activities
Highlight all contacts with overdue activities in red.
Last Activity Date
A heatmap for the number of days since the contact's last completed CRM task or sent e-mail.
Total Deal Value
If you have assigned deals to an org-chart in vizrm you can run a heat-map report that summarizes the values of all open deals a person is related to on the chart.
Thereby giving you a fast overview of the most focal & valuable contacts in the account.
Custom
Your custom coloring scheme that is configured in the view settings.