How can you use the atop function in [removed])?

Question

I need to add a line break but I am struggling with the atop function in expression(). The main is the part I would like to break into two lines.

Answer 1

You did not specify, where you want to break the string, but this example should help you:

plot(1~1, 
 main=expression(atop("bla bla bla" ~ (K[d]),
                      "bla bla bla")))