The data for each nucleotide is plotted and the assigned nucleotide (G, A, T, C or N) in the ABI file is overlayed on the graphs.
It also writes out the sequence to an output sequence file.
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The horizontal scale of the output image labelled 'Residue Position' is only a very approximate indication of the spacing of residues in the image. The real residue spacing is variable, as it relies on the speed with which the oligo-nucleotides are eluted in the ABI sequencer. Do not be surprised to see the nucleotide signals spaced at a much greater distance than the horizontal scale might suggest.