set grid
set xrange [0:2.5]
set yrange [0:5]

plot "output/barbot_map_5000_frequencies" \
	 using ($1/100.0):($2/100.0):(($3==0||$3>6)?1/0:$4) w p pt 7 ps 1 lc palette t '', \
	 "output/barbot_map_500000"	\
	 using ($1/10.0) :($2/10.0) :($3*0.7+0.3) w p pt 7 ps variable lc 3 t ''

pause mouse keypress
reread