reset

set terminal postscript enhanced color solid
set output "vector.ps"

set size square
set xrange [-16:16]
set yrange [-16:16]

set title "Position Difference between 'imexam' and 'apphot'"
set xlabel "Radius from the RA Center [arcmin]"
set ylabel "Radius from the Dec Center [arcmin]"
set sample 1000

set multiplot
set origin 0.0,0.0
set size 1.0,1.0

plot "total.list" using 9:10:6:7 with vectors lt 1 lw 3 notitle

set parametric
set origin 0.0,0.0
set size 1.0,1.0
set label "Vector Scale 600x" at 6.5,-14.5
plot [0:2*pi] 15*cos(t),15*sin(t) lt 2 lw 3 notitle
unset multiplot