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m
D_{iso} = \frac{1}{3} \left( D_x + D_y + D_z \right),
</math>
<math>
D_a = D_z - \frac{1}{2} \left( D_x + D_y \right) ,
</math>
<math>
D_r = D_y - \frac{D_x}{2D_a} .
