Table 2.

Statistical variables

Variable	Description
Trueness (RMS mean deviations)	Mean average distance of all points from each STL to RM in absolute values
Precision (standard deviation of RMS)	Standard deviation of the distances between points of each STL and RM in the RMS values
External mean discrepancy (over total %)	Percentage of the STL model that is oversized from the RM
Internal mean discrepancy (lower total %)	Percentage of the STL model that is undersized from the RM

Legend: RMS root mean square, STL standard triangle language file, RM reference model