It’s common to make two or more plots which share an axis, e.g., two
subplots with time as a common axis. When you pan and zoom around on
one, you want the other to move around with you. To facilitate this,
matplotlib Axes support a `sharex`

and `sharey`

attribute. When
you create a `subplot()`

or
`axes()`

instance, you can pass in a keyword
indicating what axes you want to share with

```
import numpy as np
import matplotlib.pyplot as plt
t = np.arange(0, 10, 0.01)
ax1 = plt.subplot(211)
ax1.plot(t, np.sin(2*np.pi*t))
ax2 = plt.subplot(212, sharex=ax1)
ax2.plot(t, np.sin(4*np.pi*t))
```

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