*********************************************************************
*                                                                                                                                      
*          Detailed Description of an Event Traffic Trace                                               
*                  from "A Line in the Sand"                                                                        
*                                                                                                                                      
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CONTACT:
=========
  Hongwei Zhang, Ph.D.
  Assistant Professor
  Department of Computer Science
  Wayne State University, Detroit, Michigan, USA
  Tel: +1 313 577 0731
  E-mail: hzhang@cs.wayne.edu
  Web: http://www.cs.wayne.edu/~hzhang/


DESCRIPTION:
=========
We describe the traffic trace for an event in the sensor network
field experiment "A Line in the Sand" (simply called Lites hereafter). 
In Lites, the network is a rectangular grid of 90 nodes, with a 5-feet
separation between neighboring grid points. One event we are
interested in is a car traversing the middle of the network along
the longer axis. The trace we are showing below governs the detections
by the sensors in a part of the Lites network, specifically a 7*7
subgrid.

What you find below is the data specifying, for each packet generated,
the sender (identified by its grid location), the packet type (corres-
ponding to the start or end of an event detection), and the time (in 
milliseconds) the packet is generated. Note that, for packet type, 0
represents the start, and 1 represents the end of an event detection.
Also note that the time of packet generation has been offset with
respect to the time that the first packet is generated in the network.

Sender      packet-type    time-of-packet-generation (milliseconds)
---------------------------------------------------------------------
(1, 0)          0               930.125000 
(1, 0)          1               7228.531250 
(2, 0)          0               1217.812500 
(2, 0)          1               8285.062500 
(3, 0)          0               780.531250 
(3, 0)          1               7178.437500 
(4, 0)          0               1014.437500 
(4, 0)          1               6490.406250 
(5, 0)          0               1447.875000 
(5, 0)          1               6872.343750 
(6, 0)          0               1306.468750 
(6, 0)          1               6782.437500 
(0, 1)          0               0.000000 
(0, 1)		1		5532.875000 
(1, 1)		0		1195.000000 
(1, 1)		1		6725.843750 
(2, 1)		0		1837.062500 
(2, 1)		1		6549.250000 
(3, 1) 		0 		1334.968750 
(3, 1) 		1 		7937.156250 
(4, 1) 		0 		840.812500 
(4, 1) 		1 		8058.406250 
(5, 1) 		0 		1843.593750 
(5, 1) 		1 		6756.500000 
(6, 1) 		0 		2224.218750 
(6, 1) 		1 		6114.125000 
(0, 2) 		0 		1669.562500 
(0, 2) 		1 		6432.906250 
(1, 2) 		0 		1079.406250 
(1, 2) 		1 		7429.093750 
(2, 2) 		0 		1472.812500 
(2, 2) 		1 		8847.250000 
(3, 2) 		0 		2059.156250 
(3, 2) 		1 		8098.187500 
(4, 2) 		0 		1793.218750 
(4, 2) 		1 		7322.812500 
(5, 2) 		0 		2119.875000 
(5, 2) 		1 		7290.625000 
(6, 2) 		0 		2376.218750 
(6, 2) 		1 		7035.562500 
(0, 3) 		0 		2057.468750 
(0, 3) 		1 		6869.312500 
(1, 3) 		0 		1956.718750 
(1, 3) 		1 		7745.062500 
(2, 3) 		0 		2202.125000 
(2, 3) 		1 		7988.781250 
(3, 3) 		0 		2361.687500 
(3, 3) 		1 		9219.531250 
(4, 3) 		0 		1794.218750 
(4, 3) 		1 		8551.000000 
(5, 3) 		0 		2118.781250 
(5, 3) 		1 		7596.781250 
(6, 3) 		0 		2954.125000 
(6, 3) 		1 		7048.218750 
(0, 4) 		0 		2754.937500 
(0, 4) 		1 		7055.281250 
(1, 4) 		0 		1921.125000 
(1, 4) 		1 		7962.218750 
(2, 4) 		0 		2115.968750 
(2, 4) 		1 		7798.281250 
(3, 4) 		0 		2263.281250 
(3, 4) 		1 		9428.562500 
(4, 4) 		0 		2518.031250 
(4, 4) 		1 		7792.000000 
(5, 4) 		0 		3098.906250 
(5, 4) 		1 		6425.750000 
(6, 4) 		0 		3127.562500 
(6, 4) 		1 		7120.687500 
(0, 5) 		0 		2754.187500 
(0, 5) 		1 		7258.812500 
(1, 5) 		0 		1871.375000 
(1, 5) 		1 		8984.906250 
(2, 5) 		0 		2380.812500 
(2, 5) 		1 		8419.718750 
(3, 5) 		0 		3034.562500 
(3, 5) 		1 		7794.187500 
(4, 5) 		0 		3210.843750 
(4, 5) 		1 		7766.968750 
(5, 5) 		0 		3039.750000 
(5, 5) 		1 		8107.343750 
(6, 5) 		0 		9352.968750 
(6, 5) 		1 		14420.562500 
(0, 6) 		0 		2966.937500 
(0, 6) 		1 		7675.656250 
(1, 6) 		0 		3101.468750 
(1, 6) 		1 		7810.187500 
(2, 6) 		0 		3270.406250 
(2, 6) 		1 		7927.687500 
(3, 6) 		0 		2910.781250 
(3, 6) 		1 		9514.937500 
(4, 6) 		0 		3093.125000 
(4, 6) 		1 		8674.375000 
(5, 6) 		0 		2730.218750 
(5, 6) 		1 		8515.562500 
(6, 6) 		0 		3343.031250 
(6, 6) 		1 		8257.906250