| Symbol | |
| BCDy, By | Constant indicating the stiffness |
| Cy | Constant that determines the shape of the entire curve |
| Dy | Constant indicating the maximum value of the curve |
| Ey | A constant representing the curvature of the curve before reaching the maximum value |
| Shy | Shift in the horizontal direction at the origin |
| Svy | Shift in the vertical direction at the origin |