/*compute the delivery rate h <speed, sent, delivered> point*/NR == 2		{			speed = $1;			sent  = $2;			del = $3;		}NR > 2		{			if( speed != $1)  			{												tmp = 0;								printf"%d \t %.2f\n", speed, del / sent * 100;							/* reinitialize the variables  */				speed = $1;				sent = $2;				del = $3;			}			else			{				sent += $2;				del += $3			}		}END		{			/* print the last row that otherwise wouldn't be printed */							printf"%d \t %.2f\n", speed, del / sent * 100;		}