Paxar TC6037PR Reference Manual page 39

L7. thickness Using the chart below for reference, write the line thickness
(1 - 99) in box L7. Measured in dots.
Note:
L8. "pattern" Line pattern. Enter "".
Example
Defines a horizontal line field as a segment starting at row 110, column 70
and ending at row 110, column 350. The line thickness is 10 dots.
Line thickness fills upward on horizontal lines, or to the right on
vertical lines.
L,S,110,70,110,350,10,"" p
Defining Fields 2-21