#Data File
#1	9
#2	10
#3	34
#4	18
#5	20
#6	22
#7	25
#8	31
#9	33
#10	34
#Plot datafile with condition
set terminal png size 600, 400
set output 'plot.png'
plot  'data10.txt' u 1:($1<7 ? $2 : 1/0)  w lp