For anyone who may be curious: yellow, cyan, and magenta (the secondary colors in the RGB color model), were NOT explicitly used in this image. Those colors are actually produced by Photoshop, when the blending options of the primary color layers are set to "Linear Dodge (Add)." The "add" is the important part - RGB is an additive color model. Green and red combine to make yellow, red and blue combine to make magenta, and blue and green combine to make cyan. Cool stuff!
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