Conduct the dimensionality analysis (Siripunvaraporn, 2012). Since Zxx and Zyy are more severely distorted, only the off-diagonal data, Zxy and Zyx, were used for the 3-D inversion to reduce the risk of producing artifacts in the inverted model.The minimum error floor was set at 5% of the |ZxyZyx| 1/2. For the outliers, the error bars were increased to be large enough relative to the neighboring data.