set term postscript
set output "ven9822.ps"
set angles degrees
set polar
set offset 1.25 1.25 0 0
set title \
 "Venus geocentric longitude and distance each 4 days, in 2-year intervals"
plot "ven1998" using 2:4 with lines, \
     "ven1998" using 2:4 with points, \
     "ven2000" using 2:4 with points, \
     "ven2002" using 2:4 with points, \
     "ven2004" using 2:4 with points, \
     "ven2006" using 2:4 with points, \
     "ven2008" using 2:4 with points, \
     "ven2010" using 2:4 with lines