Definition:
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Axial non-uniformity is a measure of how
much the sampling point spacing differs from one axis to another,
namely AN = abs (XAVG - YAVG) / ((XAVG + YAVG)/2) where abs ()
yields the absolute value. If a symbology has more than two major
axes, then AN is computed for those two average spacings which
differ the most. (ANSI) axial non-uniformity grading is defined
this way:
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