In PMM creation wizard there is the option to average and smooth the measurements.
This is introduced for materials that are difficult to measure e.g. embossed, or open weave textiles. like voile.
The averaging: will take various measurements of the same patch color and calculate an average. This is available for both Linear and target measurements
Smoothing: this removes any peaks in measurements caused by misreadings due to difficult to measure material. Often used in combination with averaging.