func Begin(){
        TraceNumber = 1; /* this is the trace number of the first trace */
}

func OnLineHeader(){
	nsamp = LH.NumSmp; /* pick up number of samples */
	output(LH);        /* output the line header */
}

func OnTrace(){
	if(Tr.PrTrNm != TraceNumber){    /* if trace number is not sequential */

                YT = Tr; /*assign trace to temporary trace */

		for(i=1;i<nsamp+1;i++){
		       	 Tr.Series[i]=0.0;  /* zero the trace data */
		}

		upperlim = Tr.PrTrNm;

		for(i=TraceNumber;i<upperlim;i++){
			Tr.PrTrNm = i;  /* fix trace header perm trace num */
                        Tr.TrcNum = i;  /* fix trace header trace number */
			output(Tr);     /* output zero trace */
		}

		Tr = YT;  /* reload YT into trace */

                TraceNumber = upperlim;
	}

	output(Tr);   /* output trace data */

	++TraceNumber; /* increment trace number */

}