Shows a range between upper and lower bounds, useful for visualizing uncertainty, confidence intervals, or min/max data. The filled band between two boundary lines highlights the spread or variability in the data.
A Year on Mars — Monthly Temperature Range at Gale Crater (°C)
Best for
- Displaying temperature high/low ranges
- Showing confidence intervals or error bands
- Visualizing min/max bounds around a central value
Avoid when
- The range is so narrow it looks like a single line
- You need to compare many series — overlapping ranges become unreadable
- Data does not have a natural upper/lower bound