set nokey

plot 'tmp.txt' index 0 title 'walk 1' with lines, \
'tmp.txt' index 1 title 'walk2' with lines, \
'tmp.txt' index 2 t 'walk3' with lines, \
'tmp.txt' index 3 t 'walk4' w l , \
'tmp.txt' index 4  with lines, \
'tmp.txt' index 5  with lines, \
'tmp.txt' index 6  with lines, \
'tmp.txt' index 7  with lines


###      The number "22" defines the font size. 
set terminal postscript epsf enhanced  22
set output "graph2.eps"

replot

set terminal X
set output