reset
set grid
set zeroaxis
set parametric
set xrange [ -10000 : 10000 ] noreverse nowriteback
set yrange [ -10000 : 10000 ] noreverse nowriteback
set trange [ -14143 : 14143 ]
set angles degree

fx(offset,t,phi)=offset+t*sin(phi)
fy(offset,t,phi)=offset+t*cos(phi)

plot fx(2000,t,-60),fy(3000,t,-60) title "offset 2000,3000", \
	fx(-4000,t,-20),fy(5000,t,-20) title "offset -4000,5000", \
	fx(8000,t,30),fy(7000,t,60) title "offset 8000,7000"