is to separately aggregate the data points belonging to each analyte peak. GC?GC peak detection popularly is performed by one of two approaches: the two-step algorithm [1] and the watershed algorithm =-=[2,3]-=-. In the two-step algorithm, traditional one-dimensional (1D) peak detection is employed on each secondary chromatogram, then detected 1D peaks are merged to form two-dimensional (2D) peaks. The water