I'm looking for a way to use fill_between in matplotlib to shade between x1 and x2 as opposed to y1 and y2.

I have a series of log plots, with depth on the Y axis, and the measured variable on the x axis and would like to shade to the left or right, as opposed to above or below, of the plotted line.

I'm sure this should be possible with fill_between but cant make it work.

As an example:

```
import numpy as np
import matplotlib.pyplot as plt
import matplotlib.gridspec as gridspec
gs = gridspec.GridSpec(3, 3)
ax1 = plt.subplot(gs[0, :])
ax2 = plt.subplot(gs[1:, 1])
y=np.random.uniform(0,1,30)
x=np.arange(30)
ax1.set_ylabel('Plot 1')
ax1.plot(x,y)
ax1.fill_between(x,y,0.5,where=y>0.5,interpolate=True)
ax2.set_ylabel('Plot 2')
ax2.plot(y,x)
ax2.set_ylim(30,0)
plt.show()
```

I have attached an image of what this produces: Essentially i want to plot something like plot 1 in the plot 2 position

Thankyou for any suggestions

you can use `fill_betweenx`

```
ax2.fill_betweenx(y,x, x2=0.5, where=x>0.5,interpolate=True)
```

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