PLOTTEXT:superscript_mode

example

          <H0.5><S1>Super-scripts are easy X<^>ABC<_>
          Multiple levels of super_scripts are allowed
          Just remember to go "down" as many
          times as you go "up"
          <S3><H2><UPSILON><^><THETA><^><PSI><^>5<_><_><_><->
          <H.5>and back to normal