set y2tics

plot "stats.txt" using 1:2 axes x1y2 title "Server Connections", \
     "stats.txt" using 1:3 axes x1y2 title "User Connections", \
     "stats.txt" using 1:4 axes x1y1 title "Tuples In" with lines, \
     "stats.txt" using 1:5 axes x1y1 title "Tuples Out" with lines
