Display whitespace guards.

ISBN-13 with tiny whitespace guard:

Data:    978-1-873671-00
Options: includetext guardwhitespace guardwidth=3 guardheight=3
Encoder: isbn

Width of the whitespace guards, in points.

Height of the whitespace guards, in points.

Override the default horizontal position of the left whitespace guard.

Override the default horizontal position of the right whitespace guard.

Override the default vertical position of the left whitespace guard.

Override the default vertical position of the right whitespace guard.

EAN-8 with very mangled whitespace guards:

Data:    95200002
Options: includetext guardwhitespace guardleftpos=14 guardrightpos=7 guardleftypos=15 guardrightypos=4
Encoder: ean8