def set_observable(self,tseq,qseq):
    """Set the observable sequence data

    :param tseq: target sequence (from the homopolymer)
    :param qseq: query sequence ( from the homopolymer)
    :type tseq: string
    :type qseq: string

    """
    tnt = None
    qnt = None
    if len(tseq) > 0: tnt = tseq[0]
    if len(qseq) > 0: qnt = qseq[0]
    self._observable.set(len(tseq),len(qseq),tnt,qnt)