black <- '#000000'
lightest_gray <- '#e0e0e0'
light_gray <- '#c0c0c0'
gray <- '#949494'
dark_gray <- '#303030'
darkest_gray <- '#1b1b1b'
white <- '#ffffff'
bgtufte <- '#fffff8'
background_colour <- white
text_colour <- black
grid_colour <- lightest_gray
tick_colour <- black
default_colour <- black
fill_colour <- gray
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