set term postscript
set output "mars9822.ps"
set angles degrees
set polar
set offset 1.25 1.25 0 0
set title \
 "Mars geocentric longitude and distance each 8 days, in 4-year intervals"
plot "mar1998" using 2:4 with lines, \
     "mar1998" using 2:4 with points, \
     "mar2002" using 2:4 with points, \
     "mar2006" using 2:4 with points, \
     "mar2010" using 2:4 with points, \
     "mar2014" using 2:4 with points, \
     "mar2018" using 2:4 with points, \
     "mar2022" using 2:4 with lines