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timedat gnuplot demo

set title 'Fsteps plot\nwith date and time as x-values'
set data style fsteps
set xlabel 'Date\nTime'
set timefmt "%d/%m/%y\t%H%M"
set yrange [ 0 : ]
set xdata time
set xrange [ "1/6/93":"1/11/93" ]
set ylabel 'Consentration\nmg/l'
set format x "%d/%m\n%H:%M"
set grid
set key left
plot 'timedat.dat' using 1:2 t '' \
, 'timedat.dat' using 1:2 t 'Total P' with points \
, 'timedat.dat' using 1:3 t '' \
, 'timedat.dat' using 1:3 t 'PO4' with points