A friend of mine has a literal heapmap, i.e. an infrared thermal camera, and that actually displays obvious outliers in striped red and white like digital camco

A friend of mine has a literal heapmap, i.e. an infrared thermal camera, and that actually displays obvious outliers in striped red and white like digital camcorders show overexposed areas. It's really useful because it works both as an alert for hotspots, and also as a reminder to ignore them.