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尝试在一个数据集中绘制多个圆圈，似乎 10 是最大圆圈数。如何绘制超过 10 个圆圈？

library(tidyverse)
library(ggforce)

circles <- data.frame(
  x0 = rep(1:3, 10),
  y0 = rep(1:3, each = 10),
  r = seq(0.1, 1, length.out = 30)
)

ggplot() +
  geom_circle(aes(x0 = x0, y0 = y0, r = r, fill = r), data = circles) +
  coord_fixed()
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