Plotting two scripts graph in single frame

#1
Hai Seniors and experts ,
Is it possible to plot graphs of two scripts in one single frame ?
If yes , pls help ?
I have heard a lot about hedging strategy in zinc and lead (MCX) ,
I want to plot the graphs of both in single frame .
Moreover , can seniors and experts throw some light on this hedging strategy?
Help and suggestions are needed .
Thanks a lot in advance .
 

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