How to interpret radar's dual spectrum?

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1

Why does the Radar layer have two spectrums? In the attached screen shot I selected distinct color palettes to differentiate them on the map.

Screenshot_20230307-101857
Screenshot_20230307-1018571080×2400 160 KB

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2

Rain and snow. This is RainViewer data. You can view the same data here:
Live Map

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3

@zreerz Hello and Welcome to the Forum and Thank You for Using Flowx

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