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Each pair of bars represents a digit. The numbers displayed correspond to ten of the fifteen pairs of bars in that type of barcode. Sometimes you’ll see digits to the side that correspond to the second and second-to-last pairs.
If you compare all bar codes of this type, you will find that the first, middle, and last pairs of bars are always the same. And they are the digit 6.
I believe their function is to provide a frame of reference to the scanner, but it is more than an odd coincidence that these reference bars are the same as the number 6.
To confirm this, you can look at where the number 6 falls in sequence below the barcode in your sample image. Look at the pair of bars just after the middle pair. Those are the only ones identical to the first, middle, and last pairs of bars. And the corresponding number is 6.