Split title of a figure in matplotlib into multiple lines

I use matplotlib to create a figure with 4 sub-plots in it.

I would like to split one of my title of a subplot, such that each line would be in the centered with respect to subplot.

I tried

import matplotlib.pylab as plt

fig = plt.figure(num=0,figsize=(8.27, 11.69), dpi=300)
ax  = fig.add_subplot(2, 2, 1)
ax.set_title(r'Normalized occupied \\ Neighbors')

and what I get is that Neighbors is indented to the left side.

How could I correct this?