[ncl-talk] one colorbar with two groups of labels

[Jian Zheng]

Hi NCLers,

Does anyone know how to draw a colorbar with two groups of labels
(represent two variables). I attach an example figure (from Deser and
Phillips 2009). One method may be adding the labels one by one, but I don't
know how to get the location for each label. Are there any other ways to
draw a similar colorbar?

Thanks in advance.
Jian
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