# NOT RUN {
x <- seq(-1, 1, length = 100)
r <- sqrt(outer(x^2, x^2, '+'))
image(r,
col = tableau_div_gradient_pal()(seq(0, 1, length = 12)))
image(r,
col = tableau_div_gradient_pal('Orange-Blue')(seq(0, 1, length = 12)))
image(r,
col = tableau_div_gradient_pal('Temperature')(seq(0, 1, length = 12)))
# }
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