![]() If you are creating a plot that has multiple colours in it then using palettes is a good idea: instead of wasting time trying to find colours that go well together you can just use a palette and cycle through the colours in that. If you specify a number larger than 8 it will wrap around and start from the beginning again, so colour = 8 will make your symbols grey (the 8th and final colour in the default colour palette) while colour = 9 will make your symbols black (the 1st colour). This is because the default colour palette is: black, red, green3, blue, cyan, magenta, yellow and grey (in that order), and blue is the 4th element of that list.
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