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A heatmap is a visual representation of link activity in your campaign. You will see colors beside each link, highlighting how many times a link was clicked. Colors range from violet to bright red: (violet, blue, green, yellow, orange, and red) - the more times a link was clicked, the warmer the color (red).
You can also download a snapshot of either the Heatmap or the actual HTML campaign as it was sent as a PNG file.