Options

Middle Point [XYZ m]
End Point [XYZ m]
First Point [XYZ m]
Center [XYZ m]
Radius [0..+∞m]
Angle [-360..360°]

These settings can be used to fine-tune the Spline Arc object or to create slight variations of the Spline Arc with modified settings (New Transform command in the Tool menu).

However, note that links to existing spline points might be lost if settings other than Center and Middle Point are modified. Additional segments will then be created. The coordinates defined here relate to the world coordinate system.