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Kenneth Moreland authored
The problem is that there is no good "default" constructor for ColorTable. The previous default constructor created an empty color table, but that would be confusing if someone actually tried to use it. We could set ot to the default preset, but the default preset uses the diverging color map, which could foul people up if they actually want to edit or create their own color map. Instead, force the declaration of ColorTable to indicate what you plan to do with it.
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