ChordSum, ChordRef  
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Menu:   Measure > Parameters  
Script:   SelectParam ("ChordSum", "ChordRef")  

Select these parameters to compute the sum of chords for each phase in Field Measurements
. The sum of chords is a stereological parameter defined as the total length of horizontal grid lines falling inside the objects belonging the phase The spacing of the grid is defined by the global variable GridSpace which has a default value of 1

ChordSum returns the length of grid lines crossing the phase, in calibrated units:

ChordRef returns the total length of grid lines in the image or selection, in calibrated units: