how to avoid '_' interpretation in plot legend ?

[Sergei Steshenko]

Hello,

if I enter, say, the following command:

plot(1:10, 1:10, "-;foo_bar;1");

, I'm getting straight red line plotted (and this is expected), but the 
legend says

foobar

with 'b' being below the rest of characters and having smaller size - 
instead of the expected

foo_bar.


I think I should use some kind of 'set' command, but "help set" does not
provide particular info.


I know that for titles I should use

set(title("foo_bar"), "Interpreter", "none");

, but I do not know what to use for legends.

Thanks,
  Sergei.