```
# NOT RUN {
require(graphics)
hsv(.5,.5,.5)
## Red tones:
n <- 20; y <- -sin(3*pi*((1:n)-1/2)/n)
op <- par(mar = rep(1.5, 4))
plot(y, axes = FALSE, frame.plot = TRUE,
xlab = "", ylab = "", pch = 21, cex = 30,
bg = rainbow(n, start = .85, end = .1),
main = "Red tones")
par(op)
# }
```

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