Henrique, 
thank you for your help. Taking into account the code in the HP graph, I have done the multiplot with several series.
Kind regards


2014-11-06 5:02 GMT-08:00 Henrique Andrade <henrique.coelho@gmail.com>:
Dear Cristián,

Do you have Lattex installed on your computer? If the answer is "yes" you can plot the series you want and save them to the session as an icon and then, using the icon view window, drag the icons to the "graph page" icon.

Best regards,
Henrique

2014-11-06 0:27 GMT-02:00 Cristián Arturo Ducoing Ruiz <cducoingr@gmail.com>:
Hello everyone, 

I have done this graph

Energy Capital ratio 
Europe and Latin America 1870 -1970


The problem, i that I need to put en any little graph another variable (Energy Intensity in this case), something similar to this simple plot




Do you have some ideas or I must do it with R? 
I'm a really Gretl fan so i preffer to do with this great software!
Thank you everyone for this user list 



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Atte.
Cristián Arturo Ducoing Ruiz


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Atte.
Cristián Arturo Ducoing Ruiz