set polar
unset xtics
unset ytics
unset key
set border 0

set title "{/:Bold Enhanced text style markup}"
set x2label "Default  {/Times:Bold=15 Bold ^{/:Italic Italic}} Default" offset 0,-2
set xlabel 'Default  {/Times=18:Italic Italic _{/:Bold Bold} ^{/:Normal Normal}} Default'

plot [t=0:4*pi] t with lines
pause -1 "Hit return to continue"
reset