How to change the font of the main title in plot()

Question

From this page I have come to understand that:

font.main=4

will give me a italic bold title for my figure. However I want neither but a pla

Answer 1

?par has

‘font’ An integer which specifies which font to use for text.  If
     possible, device drivers arrange so that 1 corresponds to
     plain text (the default), 2 to bold face, 3 to italic and 4
     to bold italic.  Also, font 5 is expected to be the symbol
     font, in Adobe symbol encoding.  On some devices font
     families can be selected by ‘family’ to choose different sets
     of 5 fonts.

All of which applies to font.main. Compare:

> layout(1:2)
> plot(1:10, font.main = 1, main = "Foo") ## plain font
> plot(1:10, main = "Foo")                ## default bold font
> layout(1)

which gives: