/*compute the throughput mean of each <speed, nHops, throughput> point*/NR == 2		{			speed = $1;			hops = $2;			th = $3;			samples = 1;		}NR > 2		{			if( (speed != $1) || (hops != $2) )			{				/* print the computed <speed, nHops, th> point */								printf"%d \t %f\n",hops, th/samples;							/* print an empty row for gnuplot compatibility */				if(speed != $1)					printf"\n\n";				/* reinitialize the variables  */				samples = 1;				speed = $1;				hops = $2;				th = $3;			}			else			{				samples ++;				th += $3;			}		}END		{			/* print the last row that otherwise wouldn't be printed */						printf"%d \t %f\n", hops, th/samples;									}