Epson Apex-80 - Manual (Page 55)

you use the grid and the programs in this section, however, you can
design your own NLQ characters.
NLQ grid
Because the NLQ characters can use as many as 18 dots vertically
and 12 dots horizontally, you plan your designs on a different grid than
the one you used for draft characters. See Figure 5-5.
Figure 5-5.
Grid for
NLQ
characters
On this grid you can use any numbered line or space. As you can
see, that includes the bottom line and the line on the right side. You
should remember to leave one or two columns blank for space between
characters, however.
5.8 User-defined Characters