set terminal png size 1024,768
set key above horizontal autotitle columnheader
set bars 5.0
set xlabel "Date"
set ylabel "Man Hours"
set grid y
set xtics rotate by -45
plot "tasktime.dat" using 1:3:4:3:4:xtic(2) title 'Time Interval' with candlesticks, \
     "tasktime.dat" using 1:5 title 'Mean' with lines