`plt.fill_between()` fills the geometric area between two vertical boundary curves $y_1(x)$ and $y_2(x)$, ideal for confidence bands and cumulative volumes.
Using a highlighter pen to tint the space sandwiched between two contour lines.
`plt.fill_between(x, y1, y2, color=..., alpha=...)`. If `y2` is omitted, it defaults to 0 (filling down to baseline).
plt.fill_between(x, y1, y2, alpha=0.3)Avoid the top errors and bad plotting practices that trip up new Python developers
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Plot `x = [1, 2, 3, 4]` and `y = [2, 6, 4, 8]` with `color='#FFB86B'`, then call `plt.fill_between(x, y, color='#FFB86B', alpha=0.3)`.
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