tex-font-script-display

tex-font-script-display is a variable defined in `tex-mode.el'.
Its value is

(-0.2 0.2)

Documentation:
How much to lower and raise subscript and superscript content.
This is a list of two floats. The first is negative and
specifies how much subscript is lowered, the second is positive
and specifies how much superscript is raised. Heights are
measured relative to that of the normal text.

You can customize this variable.

This variable was introduced, or its default value was changed, in version 23.1 of Emacs.