The only way you can make colour coding on cells like that is to use the format expression, but the expression you would need does not appear to work, i.e. <format type="color" field="Conn_Max">
<colorPalette type="expression">case(tonumber(mvindex(split(value,"-"), 0)) > (tonumber(mvindex(split(value,"-"), 1)) * .8), "#FF0000", tonumber(mvindex(split(value,"-"), 0)) > (tonumber(mvindex(split(value,"-"), 1)) * .5), "#FFFFCC", 1==1, "#00FF00")</colorPalette>
</format> What this attempts to do is to split the numbers and calculate the values, but it does not work - I believe there is a bug when using multivalue eval expressions. Otherwise, I don't believe it's possible to do it this way, you would have to do it differently
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