W2
(Width2) represents the front part
W3 (WIDTH3) is the slope width.
Each radius RAD [1] & RAD
[2] may be redefined.
Image below represents default "S" radius (D-D2)/2:
When
SD1 (Shelf Depth 1) is different from SD2 (Shelf Depth
2), 20-20 uses only SD2 and repeats front curve.
W2
(Width2) represents the withdrawn front part
W3 (WIDTH3) is the slope
width.