Classed Choropleth Map

http://www.neighbourhood.statistics.gov.uk/dissemination/Info.do?page=userguide/detailedguidance/statisticalpresentation/statisticalmaps/best-practice-statistical-maps.htm

  A classed choropleth map is a type of choropleth map that separates the data into small intervals. It is broken down into a scale and presented using colored intervals to visually demonstrate the variation among intervals. In this map there are 5 intervals that are identified using five different shades of pink. These intervals break down the amount of spending in millions by residents of Great Britain.