1. The temperature gauge shows you if your creative content e.g. links, dynamic content etc, has been clicked on often or not.
A red highlight on the feature shows it is Hot and has been clicked many times, whereas a blue highlight means it is Cold and has not been clicked on often or at all. The colours vary according to the 'temperature'.

2. Here you can filter to only show Total Hits or Audience Count, changing the heat map to show these variables.

3. The table shows you the creative content in your email and the hit count i.e. number of times it is clicked.