Higher Order Diffraction: Why Do Colors Appear Different and Overlap?

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Hi everybody ,Why arrangement of colors in higher order of diffraction is different from order 1 , 2 ?
Thanks
 
on Phys.org
The colors are spread out more, but the order of the colors should be the same (ROYGBIV). But if you go to a negative order, the colors are reversed.
 
Also, the higher orders may overlap, which can confuse you if you're looking at the entire pattern.
 
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