set terminal png  
#set output -
set grid
set size 1,3
set bmargin 4
set rmargin 4
set timestamp "%d.%m.%y %H:%M" top
set multiplot;                          # get into multiplot mode
set size 1,1;  
set origin 0,2;
#set title "Akku Spannung/" 
plot "nica10.TXT" using 0:3 title "Spannung[V]" with lines
set origin 0,1;
plot "nica10.TXT" using 0:6 title "Strom[A]" with lines
set origin 0,0;
plot "nica10.TXT" using 0:4 title "Spannungs änderung" with lines