Additionally, a TP, FN, FP, and TN fragment mass were investigated. For the TP (Figure ) and FP (Figure ) case, it can be seen that the score CN L for the m/z of those signals is above the score CN L threshold. However, the FP fragment with a m/z of 160.974 Da was not recorded in the databases that were used for constructing the suspect list. This signal could either be a unrecorded fragment m/z for this compound in the databases, noise, or background signal with a high probability to be a fragment of the precursor in question.