## Plotting error bars

Let's say you have some continuous data with a continuous error (or variance) measurement. Typically, you would just call matplotlib's errorbar function:

```
import numpy as np
import matplotlib.pyplot as plt
x = np.linspace(0, 2 * np.pi)
y_sin = np.sin(x)
y_cos = np.cos(x)
plt.errorbar ...
```