set terminal svg enhanced size 1280 960 fixed
set output "/tmp/3-Spalten-Grafik.svg"
set object 1 rectangle from screen 0,0 to screen 1,1 fillcolor rgb "white" behind
set samples 1001                # high quality
set border 31 linewidth .3      # thin border
set grid
set xdata time                  # x-Achse wird im Datums/Zeitformat skaliert
set timefmt "%Y-%m-%d_%H"       # Format der vorliegenden Datums- oder Zeitangaben
set format x "%Y-%m-%d, %H Uhr" # Format für die Achsenbeschriftung
set xlabel "Zeit"
set ylabel "Anzahl"
set xtics rotate
set boxwidth 0.85 relative
set style fill solid 1.0
set key left top                #outside box
plot "/tmp/3-Spalten.dat" using 1:2 with linespoints lc rgb 'blue' title ' Spalte 2', "/tmp/3-Spalten.dat" using 1:3 with linespoints lc rgb 'red' title ' Spalte 3'