I would like to make three plots, one showing a signal (for example  
sin(x)) a second one with some random noise
and a third one showing first+second. This means to use the same random  
values on second a third plot.

I can use gnuplot to make to tables with values and some script to add  
both tables (or join both in a new table),
but I would like to know if there exist some easier way of doing it.

Thank you,

Ignasi

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