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Interpretation of calibration results

#1
Hi, 

In the robot calibration results, there is the following value : 
mean (mm)   std (mm)   max (mm)   Six Sigma   points. 

I believe the value of Six Sigma shown is "mean + 3*std". Should it be written '3 sigma' instead of "six sigma", or is there a reference to a norm that explain why six sigma = mean + 3*std ?


Thanks for the clarification 
  




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