Epson EPL-6200 Reference Manual page 285

Join
Allows you to define how the ends of lines should be joined. The
default setting is Mitered. See the illustrations below.
NONE
ROUND
Pen0, Pen1, Pen2, Pen3, Pen4, Pen5, Pen6
Allows you to select the line width. You can select a value from
0.05 mm to 5.00 mm, in increments of 0.05 mm. Pen3 to Pen6 are
available only in GLlike mode.
268
Using the Remote Control Panel Utility (EPL-6200 only)
MITERED
MITEREDBEVELED
BEVELED
TRIANGULAR