More control on the width of the white zone of divergent colorbars

[RondeauG]

Description

I have this colorbar:

Let's say that I'm not interested in values below ±4 (they are within the internal variability, or whatever). I would appreciate a way to easily hide them and associate all of that range to a white color.

What I did

I can use da.where(np.abs(da) > 4) to hide those grid cells on the graph itself, but the colorbar will stay the same and will be confusing. This is not a solution.

Ideally, I would also like the color gradient to start after the white zone (±4 in this example), which would not happen with the .where() solution.