private Rtt_Send(Rtt_Echo next = null, Rtt_Send next_s = null, float ave = 0, float std = 0)
{
this.next = next;
this.next_s = next_s;
this.ave = ave;
this.std = std;
}
private Rtt_Echo(float gap = 0, int sn = 0, int en = 0, Rtt_Echo next_e = null)
{
this.gap = gap;
this.sn = sn;
this.en = en;
this.next_e = next_e;
}
