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Code 128 can also encode digits at double density (2 per byte) and has a mandatory checksum. Code 128 is well supported and commonly used -- for example, by UPS for tracking labels. Because of these qualities, Code 128 is probably the best choice for a linear symbology today (assuming you have a choice). Options that may be passed to constructor: value (int, or numeric string. required.): The value to encode. barWidth (float, default .0075): X-Dimension, or width of the smallest element Minumum is .0075 inch (7.5 mils). barHeight (float, see default below): Height of the symbol. Default is the height of the two bearer bars (if they exist) plus the greater of .25 inch or .15 times the symbol's length. quiet (bool, default 1): Wether to include quiet zones in the symbol. lquiet (float, see default below): Quiet zone size to left of code, if quiet is true. Default is the greater of .25 inch, or 10 barWidth rquiet (float, defaults as above): Quiet zone size to right left of code, if quiet is true. 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