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# Make filled polygons between two curves in Python using Matplotlib

• Last Updated : 27 Apr, 2020

Matplotlib is an amazing visualization library in Python for 2D plots of arrays. Matplotlib is a multi-platform data visualization library built on NumPy arrays and designed to work with the broader SciPy stack.

To create filled polygons between two curves a PolyCollection filling needs to be created between y1 and y2.

1. x: It is an array of length N that holds data of x.
2. y1: It is an array or a scalar of length N that holds data of y.
3. y2:It is an array or a scalar of length N that holds data of y.

Example:

 `import` `matplotlib.pyplot as plt``import` `numpy as np``# set the width ``width ``=` `3.5`` ` `# set the height``height ``=` `2.5`` ` `# set the depth``depth ``=` `65`` ` `# plot the figure``plt.figure(figsize ``=``(width, height), dpi ``=` `depth)`` ` `# set the x array of length 3``x ``=` `[``1``, ``3``, ``6``]`` ` `# set y1 array of length 3``y1 ``=` `[``2``, ``3.5``, ``4``]`` ` `# set y2 array of length 3``y2 ``=` `[``3``, ``4``, ``5.5``]`` ` `# fill the horizontal arean between y1 and y2``plt.fill_between(x, y1, y2)`` ` `# show the plotted figure``plt.show()`

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