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Trying to Understand Library Match Factors, MH B.08

Question asked by trifecta on Nov 12, 2018
Latest reply on May 23, 2019 by nbohni

I'm hoping someone can help me understand the library match factors from Quant MH B.08.  The attached pdf shows 3 examples.  In the first example, the match factor or match score of 89 makes sense to me.  Most of the masses are present and there are no extra masses in the unknown spectrum (top).  The middle overlay shows a match of 41.5.  This doesn't look right to me as only 1 of 4-6 major masses is present, but it is one of the library masses. The last example really has me wondering what is going on.  I agree the unknown spectrum is only one mass but the match of 30 is strange.  None of the library masses are present.  I'm open to ideas.  Thank you.