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14<br />
12<br />
Range, Nautical Miles<br />
10<br />
8<br />
6<br />
4<br />
TA Range Boundary<br />
for SL=5<br />
RA Range Boundary<br />
for SL=5<br />
2<br />
0<br />
0 200 400 600 800 1000 1200<br />
Range Closure Rate, Knots<br />
Figure 10. TA/RA Range Boundaries for SL5 using Unmodified Tau<br />
Slow Overtake<br />
Slow Horizontal<br />
Closure Rate<br />
Slow Vertical Closure Rate<br />
Figure 11. Need for Modified Tau<br />
24