English: This graph shows the percentage abundance of Carbon Dioxide, Nitrogen and Oxygen in the atmospheres of Mars, Venus and Earth

Generated using gnuplot:

set title "Composition of Atmosphere"
set xtics ("Venus" 0.5, "Mars" 2.5, "Earth" 4.5) nomirror
set ytics nomirror
set tic scale 0
set border 3 
set boxwidth 0.5
set style fill solid
set style fill transparent solid 0.70 noborder

plot 'earth_venus_mars.dat'  every 3    using 1:2 with boxes lc rgb "red" title "Carbon Dioxide",\
     'earth_venus_mars.dat'  every 3::1 using 1:2 with boxes lc rgb "green" title "Nitrogen",\
     'earth_venus_mars.dat'  every 3::2 using 1:2 with boxes lc rgb "blue" title "Oxygen"

With data:

0 96.5

0.5 3.5

1.0 0

2 9 5.32

2.5 2.7

3 0.13

4 0.04

4.5 78.08

5 20.95