There are three ways to enter data.
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First, you can enter data values into the precinct fields below. The values will be rendered from blue for the smallest, through purple, to red for the largest number.
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Second, you can paste in a column of 21 numbers. The values will be assigned to the precincts in order 1-21. Again, the values will be rendered from blue to red.
If you don't like the red-blue color scheme used in the above methods, you
can select different endpoint colors.
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Finally, you can make maps with arbitrary colors
by pasting in a block of 21 lines, 4 numbers per line: red, green, blue,
value (no commas). The red, green, and blue numbers must be between 0.0
and 1.0 inclusive. Those three numbers define the color of the precinct.
The final value is placed next to the color as a label in the legend.
For a trick to keep colors constant across multiple maps, see this note.
Don't forget to give your map a descriptive title!