On the help page of pcfitplane(), the returned meanError is explained as "mean square error (MSE)". In my test, the returned meanError is 0.0042. If it is MSE, the RMSE (root mean square error) is 0.065 (meters). This is unreasonable because the maxDistance is set to 0.05 (meters). The RMSE shouldn't be larger than the maxDistance (the max distance from an inlier point to the plane). If the returned meanError is interpreted as "mean error" (0.0042 meters), it seems to be more consistent to the plot. My code and data are attached for reference.