I'm trying to write text with chemical equations in them. For example H20, with the "2" lowered as subscript. Sometimes I want electrical charges like "+3" as superscript. If I'm typing text and hit Cntl-_ to use subscript, it changes to inline math mode, which is not what I want -- I don't want italics, and I don't want extra spaces inserted between certain symbols. Is there a way to just use sub/superscript in the text style?