Summary

set term table
set output "table.tbl"
set xrange [-4.5 : 4.5]
set yrange [-6 : 6]
set zrange [0 : 1000]

set size ratio 1.33

set isosample 500
set nosurface
set contour base
set view 0,0
set ticslevel 0
#set cntrparam bspline
set cntrparam levels incremental 0, 1, 40


s = 2
l = 6
splot (2*pi*l)/s-log(4*((sin(x*pi/s))**2+(sinh(y*pi/s))**2)) notitle w line

set style line 1 lt 6 lw 1


unset tics
unset key

set term svg
set output "pot.svg"
plot "table.tbl" using 1:2 with lines ls 1

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