This is a very detailed "How-to" blog post which takes the reader step-by-step through the creation of a "HeatMap". This is the sort of visual presentation that shows "heat" (color intesity) using some data points connected to physical locations - like countries, in this case - as the source. The post describes taking data from the web, putting the data into a useful form and then creating the map using spreadsheet gadgets. Very well done - except that the author did not provide a link to the underlying spreadsheet example for readers to use as a starting point.
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