ggplot2 - R/Knitr/ggplot - set default line width for entire document -

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i know how change line graph using aes geom_line, adjusts line individual graph it's bound to.

how can specify line entire graph? in way similar how can adjust font size document graphs: 

theme_set(theme_gray(base_size = 28))

thanks!

i hope wrong, not believe possible in way request.


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