[R] barplot - change width of bar outline

[CAB]

Dear R users
I am modifying a column chart which I have created in R using barplot to
make it clearer. I have been able to change the settings to increase the
width of the axes lines and the text size but I cannot find the code to
change the width of the lines which create the bars/columns themselves. Can
anyone point me in the right direction please?
Many thanks
Claire

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