Epson FX-1050 User Manual page 82

Single
In this figure you can see the main rules for graphic design in the three
densities:
In single-density no dots can be placed on vertical lines.
l
In high-speed double-density, dots can be placed on vertical lines, but
l
no dots can overlap.
In double-density, dots can be placed on vertical lines, and they can
l
overlap.
Now look at the high-speed double-density design below. It should point
you in the right direction for your own work.
Using Software and Graphics
High-speed
double
Double
4-17