how to add subtitle matplotlib 1

how to add subtitle matplotlib

import pandas as pd
import matplotlib.pyplot as plt

d = {'series a' : pd.Series([1., 2., 3.], index=['a', 'b', 'c']),
      'series b' : pd.Series([1., 2., 3., 4.], index=['a', 'b', 'c', 'd'])}
df = pd.DataFrame(d)

title_string = "This is the title"
subtitle_string = "This is the subtitle"

plt.suptitle(title_string, y=1.05, fontsize=18)
plt.title(subtitle_string, fontsize=10)

Here is what the above code is Doing:
1. Create a figure
2. Plot the dataframe
3. Add a title to the figure
4. Add a subtitle to the figure

The problem is that the subtitle is not centered.
I want the subtitle to be centered under the title.

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