[ferret_users] Custom colorbar/ Multiple Palettes

[Ashley Watson <ashleywats@xxxxxxxxx>]

Hi ferreters,

    I want to specify multiple palettes for my shade plot. My data values are in the range -120 to 120.
 All I want to do is to define different colors for my plot. For example, I want to specify white color (or no color)
for values -20 to 20,  and Blue palette for positive values (20 to
120) and  Red palette for negative values.(-20 to -120).
 How can I make such plot?

Ashley