It looks like going from blue (-20) to white to blue (+20).
It could be modified by using a different color palette - for example blue/green, blue/red, yellow/blue. A good indicator is also if the colors are still discernable in grayscale altough this will be pretty much impossible on a divergent color scale unless you add a second identifier such as dots.
It looks like going from blue (-20) to white to blue (+20). It could be modified by using a different color palette - for example blue/green, blue/red, yellow/blue. A good indicator is also if the colors are still discernable in grayscale altough this will be pretty much impossible on a divergent color scale unless you add a second identifier such as dots.