Epson Apex-80 - Manual (Page 45)

Widening or narrowing the characters also widens or narrows the
spaces between words and letters. Because word processors usually
create a left margin by printing spaces, you may need to change the
number of characters on a line to keep the margins correct if you
change widths. For example, a left margin of five pica characters is the
same as one of six elite characters.
Special Effects and Emphasis
The Apex80 offers two ways of emphasizing parts of your text and
also allows you to use underlining, superscripts, and subscripts. Most of
these features can be controlled only by software commands, but many
application programs can produce them if they are properly installed.
Emphasized and double-strike modes, both of which can be chosen
with SelecType, slow the printer down slightly to produce bolder text.
In emphasized mode, the Apex80 prints each character twice as the
print head moves across the paper, with the second slightly to the right
of the first. This produces darker, more fully-formed characters.
In double-strike mode, the Apex80 prints each line twice, with the
second slightly below the first. This makes the characters bolder. While
NLQ is in use, however, double-strike is ignored because NLQ
characters are already formed by two passes of the print head.
This is normal NLQ printing.
This is emphasized NLQ printing,
Superscripts and subscripts are valuable for such purposes as printing
footnote numbers or parts of mathematical formulas, and the underline
mode provides an automatic way of underlining fully any piece of text.
It underlines spaces, subscripts, and superscripts without a break.
The example below shows underlining with text and combined with
superscripts and subscripts in a mathematical formula.
Apex80 Printer Features 4.3