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set terminal svg size 900, 500
set output "coarse_grid3.svg"
set xlabel "Grid points"
set ylabel "Residual value"
set title "Coarse grid correction"
set key outside
set key autotitle columnhead
set pointsize 0.5

plot "coarse_grid.data" index  3 using 1:2 with linespoints lt 4 lw 1