plot using gnuplot or python -

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i have txt file trajectories. how can plot column 3 gnuplot , have vertical line separate trajectories. 

#indexes:         0    1        -0.375e+04         0.382e+01            2        -0.375e+04         0.332e+01            3        -0.376e+04         0.353e+01         #indexes:        1    1        -0.735e+04         0.093e+01    2        -0.735e+04         0.096e+01    3        -0.735e+04         0.082e+01    4        -0.735e+04         0.094e+01 #indexes:         2    1        -0.835e+04         0.401e+01    2        -0.035e+04         0.438e+01    3        -0.365e+04         0.438e+01

i have many indexes.

photo:

enter image description here

here's example shell script works example data. assumes data in file data, creates 2nd tmp file /tmp/data2, , image /tmp/data.png.

#!/bin/bash max=$(awk <data '  !/^#indexes/{ if($3+0>max)max = $3 }  end {print max}')  awk <data >/tmp/data2 -vmax="$max" '   /^#indexes/ {printf "%s %s\n",i,max; next}               { i++; }'  gnuplot <<\! set terminal png set output "/tmp/data.png" plot "data" using 3 lines linetype rgb "red",\  "/tmp/data2" using 1:2 impulse linetype rgb "blue" ! # eg: display /tmp/data.png

the first awk finds max value of 3rd field. 2nd awk creates data line "i max" each "#indexes" line, i counts number of data lines, i.e. x axis values blue vertical lines.


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