Analytical run-axis Z component
0.9999991810.999999 ratio
Unit vector from the registered top center toward the registered lower center.
Drawing notation: CENTER LINE OF ENTRANCE; Main entrance stair plan; section line A
Targeted W3 Main-entrance crop reviewed after OCR/index and existing stair-package review. Pixel picks are manual plan traces, not printed dimensions.
Calculated from: main-north-w3-top-center-world-x, main-north-w3-top-center-world-z, main-north-w3-bottom-center-world-x, main-north-w3-bottom-center-world-z