There is another acronym, MNP, that means Multiple Nucleotide Polymorphism, but it's rarely used. It's very common to use SNP even if the variation is two or three nucleotides.
Sure, but three is a far cry from 50-150, which would almost certainly be reported as a rearrangement or some other sort of structural variation, and would be detected with an entirely different method than SNPs.
Alternately, they're talking about their sequencing reads and calling them SNPs.
I think I should just chalk this one up to my own personal Gell-Mann amnesia and let the article authors do their thing.
