Epson 4500 - Manual (Page 126)

Graphics
Notice that the dots overlap quite a bit. This design was printed using
the triple-density, 24-pin graphics option because the density is the same
(180
dots per inch) in both directions (horizontal and vertical).
Adding the following lines to the preceding program causes the pattern
to print 10 times in a row as shown below:
15 FOR C-1 TO 10:RESTORE
65 NEXT C
Software and Graphics 4-19