I have plotted the grouped bar plot and I want to have spacing between orange and blue bar.

I am not sure how to.
It is the sample image - I want little space between blue and orange bar.
[![enter image description here](https://i.stack.imgur.com/o2vHG.png)](https://i.stack.imgur.com/o2vHG.png)

```
import numpy as np
import matplotlib.pyplot as plt

N=4
a = [63,13,12,45]
b = [22,6,9,9]

ind = np.arange(N)
width=0.35

fig, ax = plt.subplots()
b1 = ax.bar(ind, a, width)
b2 = ax.bar(ind+width, b, width)

ax.set_xticks(ind+width/2)
plt.show()

```