# Make filled polygons between two curves in Python using Matplotlib

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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