Sunset rainbow over Koolaus

Working with some old pictures, this one from 2005, is a panorama made using Photoshop then some Lightroom editing, still some grain. This is a sunset shower over the Kooloau mountains on Oahu, Hawaii. Just before sunset the sun setting in the west might occasionally cause a brief huge rainbow. In the very top right you can see a short section of the right side of the rainbow.
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