The gradations are divided in the following steps (unit: inhabitants per square kilometre): 0 to under 100, 100 to under 150, 150 to under 250, 250 to under 750, 750 to under 1500 and all over 1500. The more vivid the colour, the higher the population density.
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Own work based on: <a href="//commons.wikimedia.org/wiki/File:Landkreise,_Kreise_und_kreisfreie_St%C3%A4dte_in_Deutschland_2016-11-01.svg" title="File:Landkreise, Kreise und kreisfreie Städte in Deutschland 2016-11-01.svg">Landkreise, Kreise und kreisfreie Städte in Deutschland 2016-11-01.svg</a> <i>by</i> <a href="//commons.wikimedia.org/wiki/User:TUBS" title="User:TUBS">TUBS</a>