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Grey scale palette (discrete)
pal_grey(start = 0.2, end = 0.8)grey_pal(start = 0.2, end = 0.8)
grey_pal(start = 0.2, end = 0.8)
grey value at low end of palette
grey value at high end of palette
pal_seq_gradient() for continuous version
pal_seq_gradient()
show_col(pal_grey()(25)) show_col(pal_grey(0, 1)(25))
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