This map becomes un-classed by using continuous grey scale.
(http://images.google.com/imgres?imgurl=http://www.agocg.ac.uk/reports/visual/casestud/dykes/figure11.gif&imgrefurl=http://www.agocg.ac.uk/reports/visual/casestud/dykes/issue3_1.htm&usg=__421XADjdHS7bnzDj0o4stIL3SoU=&h=336&w=405&sz=14&hl=en&start=71&um=1&itbs=1&tbnid=ecJ6eNMPHR_MqM:&tbnh=103&tbnw=124&prev=/images%3Fq%3Dchoropleth%2Bmap%2Bunclassed%26start%3D54%26um%3D1%26hl%3Den%26client%3Dfirefox-a%26sa%3DN%26rls%3Dorg.mozilla:en-US:official%26ndsp%3D18%26tbs%3Disch:1)
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