set xrange[0:10]
set yrange[0:11]
set zeroaxis lt -1 lw 1

unset tics


set style arrow 1 size character 2,20 filled linewidth 1
set arrow 1 from 3,1 to 3,9 arrowstyle 1     # B_0
    set label "B_0" at 3,9.3 center font "Arial,12"
set arrow 2 from 3,1 to 8,4 arrowstyle 1     # k
    set label "k" at 8.2,4 center font "Arial,12"
set arrow 3 from 3,1 to 6.5,6 arrowstyle 1     # v_1
    set label "v_1" at 6.7,6.2 center font "Arial,12"


set style arrow 2 size character 2,20 filled linewidth 3
set arrow 4 from 3,1 to 3,3.9 arrowstyle 2     # v_1z
    set label "v_{1z}" at 2.6,3.9  center font "Arial,12"
set arrow 5 from 3,1 to 6.5,3.1 arrowstyle 2     # v_1k
    set label "v_{1k}" at 6.5,2.6  center font "Arial,12"


set style arrow 3 size character 2,20 filled linewidth 5
set arrow 6 from 3,1 to 3,2.5 arrowstyle 3     #e_z
    set label "e_z" at 2.6,2.5  font "Arial,12"
set arrow 7 from 3,1 to 4.4,1.84 arrowstyle 3  #e_k
    set label "e_k" at 4.4,1.5  font "Arial,12"


plot "coordinate2.txt" notitle with line lc rgb "gray"
replot "coordinate3.txt" notitle with line lc rgb "gray"


set terminal png
set output "CO4.png"
replot