' - - File:X1_Family5.txt
r=2.5
X{t} = t
Y{t} = t^2 * Exp[-t/r]
Z{t} = 0

F<t> = <X, Y, Z>

t0 = 0  :  tf = 20  :  n =200
Plot[F,{t, t0, tf,n}]

' Set scale X =1  and  scale Y = 0.2 .
' Experiment with unclicking the axes option or not PRIOR to generating the plots.




