set yrange [0:109]
set xrange [-2:37]
set grid x
set grid y
set xlabel "Column"
set ylabel "% of chips with codes 0,39,96,97,98,99"
set boxwidth 0.6
plot "pre_cm1v8" using 1:4 title "preproduction wafers 18..32, 8603 chips" with boxes, "pre_cm1v8" using 1:3 title "Rel.# of chips" with histeps lw 4
pause -1
set terminal png
set output "pre_cm1v8.png"
replot