Question: global plot parameters

Hello,

I am wondering if there is any way to set global plot parameters.

Currently, I am making a series of plots.  I need two copies of each, one with default line thickness, to put in a document, and another with thicker lines to use with a projector.  The only way I know how to do this is to add the thickness=2 option to each command, which gets tedious.  Is there some way to change the default thickness of a line so that I don't have to enter it separately for each command? 

Same question for any other plot parameter.

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