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Bars and spaces.
The bars and spaces determine the pattern of the encoded data. Each symbology represents a different strategy behind the creation of these patterns such as: being as condense as possible, printing as easily as possible, being as easy to decipher as quickly as possible, etc. Each bar code has slightly different quiet zone requirements. For example, the quiet zone of Code 39 is ten times the width of the thinnest bar/space or 0.25 inches, whichever is greater.