gnuplot /gallery / cal6



 set term table set xrange [0. : 50 ] set yrange [0. : 50 ] set zrange [-500 : 1000 ]  set xtics 10 set ytics 10 set mxtics 2 set mytics 2  set nosurface set cont set view 0,0 set ticslevel 0 set cntrparam levels auto 10  set output "covar.tbl" splot "covar.dat" u ($1/10):($2/10):3 notitle w line   set term postscript eps enhanced color solid  set size sq 0.7,0.7 set zero 1e-20 set key screen 0.60, screen 0.65 set pointsize 0.6 set tmargin 1  set mxtics  5 set mytics  5 set xtics  10 set ytics  10  set xrange [ 0 : 50 ] set yrange [ 0 : 50 ]  set xlabel "Energy [keV]" set ylabel "Energy [keV]"  set linestyle 1 lt 1 lw 1 set linestyle 2 lt 2 lw 1 set linestyle 3 lt 3 lw 1 set linestyle 4 lt 4 lw 1 pt 4 set linestyle 5 lt 5 lw 1 pt 5 set linestyle 6 lt 6 lw 1 pt 6 set linestyle 7 lt 7 lw 1 pt 7  set output "covar.eps" plot "covar.tbl" i 0:0  u 1:2  ti "1000"  w l ls 1,  "covar.tbl" i 1:1  u 1:2  ti "800"   w l ls 2,  "covar.tbl" i 2:2  u 1:2  ti "600"   w l ls 3,  "covar.tbl" i 3:3  u 1:2  ti "400"   w l ls 4,  "covar.tbl" i 4:4  u 1:2  ti "200"   w l ls 5,  "covar.tbl" i 5:5  u 1:2  ti "0"     w l ls 6,  "covar.tbl" i 6:6  u 1:2  ti "-200"  w lp ls 7,  "covar.tbl" i 7:7  u 1:2  ti "-400"  w lp ls 6,  "covar.tbl" i 8:8  u 1:2  ti "-600"  w lp ls 5,  "covar.tbl" i 9:9  u 1:2  ti "-800"  w lp ls 4  pause -1 

covar.png