Star Micronics TSP400 Series Programmer's Manual page 121

The Height indicates the size of the bar code.
The Corresponding size is reflected on the screen:
Choosing will print the human readable code below the bar code. This
option leads you to another menu where you can position and alter the character-
istics of the text.
The Spacing refers to the distance between one character an another. Press
when you are ready.
The Mode indicates the thickness of the bar code lines:
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