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Peak calling. After the centre of the peak is identified (red line), the values in a window around the centre are analysed (yellow). The minima on the left and right side are identified (dashed horizontal lines) and the higher value is used as threshold. Next, the peak is expanded (green arrows) by adding all genomic position whose value is higher than the threshold to the left and to the right side of the centre. The final peak is shown in purple
