Start Point on the X-Axis distance from the reference Start Point on the Y-Axis distance from the reference End Point on the X-Axis distance from the reference End Point on the Y-Axis distance from the reference Number of Points measured DIN, ISO, ASTM, ASME, or Federal G-Series Measurement Specifications [plain text] The minimum normal (perpendicular) distance between two parallel planes that fully contain a surface along a specified line.