set term pdf fontscale 0.75 size 6in,3in
outfile = 'beta.pdf'
set output outfile
print outfile
set multiplot
set origin 0.,0.
set size 1.,0.45
set xlabel "z-position (m)"
set xrange [0:755]
set yrange [0:40]
set ytics 0,10
set ylabel '{/Symbol b}_x [m]'
plot "twissparam.dat" u ($3):($4) i 0:0 w l not "beta x"
set size 1.,0.4
unset xlabel
unset xtics
set xtics ("" 0, "" 100, "" 200, "" 300, "" 400, "" 500, "" 600, "" 700)
set origin 0.,0.37
set ylabel '{/Symbol b}_y [m]'
plot "twissparam.dat" u ($3):($7) i 0:0  w l not "beta y"
#plot "twissparam.dat" u ($3):($6) w l t "eta x"
unset multiplot
outfile = 'beta_ext.pdf'
set output outfile
print outfile
unset multiplot
set key at graph 0.2,0.9
set autoscale x
set ylabel '{/Symbol b} [m]'
set xlabel 'z [m]'
set xtics 0,10
plot "twissparam.dat" u ($3):($4) i 1:1 w l t "{/Symbol b}_x",'' u ($3):($8) i 1:1 w l t "{/Symbol b}_y"