322 Geometric Dimensioning and Tolerancing An alternate method used when the profile tolerance is unequally disposed displays the total tolerance inside the feature control frame. Either the inside or outside of true profile is shown as a basic dimension. Example 9-7 shows the unequally disposed profile tolerance on the inside as a basic dimension of 0.2. The same result can be achieved by showing a basic dimension of 0.3 on the outside. One or the other must be dimensioned to show which way the tolerance applies and how much profile tolerance is allowed inside or outside. A dimension line with arrowheads is placed on each side of the phantom lines and connects the feature control frame with a leader. The basic dimension is required because the true profile is defined by basic dimensions and the tolerance zone must also be defined basic. The actual profile of the part must be between the basic zone created around the true profile. The Drawing The Meaning 0.2 profile tolerance True profile 0.5 total profile tolerance Example 9-7. Using a basic dimension to indicate an unequally disposed profi le tolerance.