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Axial plane or surface depending upon whether the folds are cylindrical or not is a plane or surface that divides the fold as symmetrically as possible, bisecting the interlimb angle of the fold so that if the latter is 90 degrees, the axial plane would make an angle of 45 degrees with each limb. If the fold is symmetrical, the axial plane is vertical as shown in the figure but would depart from verticality if the fold was asymmetrical or overturned. In case of an isoclinal fold, the interlimb angle is zero or 180 and the axial plane is parallel to both the limbs.