324 Geometric Dimensioning and Tolerancing Profile of a Surface between Two Points The profile of a surface tolerance zone is equally disposed bilateral unless otherwise specified, just as for profile of a line. Profile of a surface can be between two points and is handled in the same manner used for profile of a line between two points. A sample drawing and its related meaning are shown in Example 9-10. Actual profile may be anywhere inside profile tolerance zone 0.4 profile tolerance zone equally split on both sides to true profile True profile Datum plane A The Meaning The Drawing Example 9-10. A profi le of a surface tolerance specifi ed between two points.