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Resolving overlapped test peaks by fitting control peaks to the test spectrum. The well separated control peaks 1 and 2 become overlapped in the test spectrum, hence only the peak top a is picked and matched to 2, while 1 remains unmatched. After fitting 1 and 2 to the envelope, the resolved peaks (dotted lines) b and a′ are matched to 1 and 2, respectively.
