set term png
set output "circle_grid.png"
unset key
set size ratio -1 1, 1
set title "Circle Grid" 
set xrange [ 0.0 : 8.0 ]
set yrange [ 0.0 : 8.0 ]
set timestamp
plot 'circle_grid_data.txt' with circles lc rgb "blue" fs transparent solid 0.55 noborder