the maximum allowable stand density above which stands must be spaced to a target density of well-spaced acceptable stems to achieve free-growing status.

The highest degree of darkness (light absorption of opacity) of a photographic image. It is crucial to monitor this with four-color process printing. It is determined by adding up the percentages of density on all four films and relating it to the ink absorption properties of the paper to be used.

The dry unit weight defined by the peak of a compaction curve.