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height, giving more leeway to symbols printed with above minimum row heights
(e.g., 4.0 X). A poor grade here is corrected by either stretching the symbol ver-
tically or correcting the print condition (e.g., turning down the thermal burn set-
ting or adjusting inking) that causes rows to interfere.
X-dimension
The X-dimension is an approximate measure of the average width of the narrow
elements in a 2D stacked bar code symbol or a single element or module in a
2D matrix symbol, and indicates growth or shrinkage of the element widths.