Safety motion
This option is available only if the parameter "Return to safe plane" is YES.
This parameter allows to define lead in and lead out Z orientation.
Three solutions are available

Z part
The lead in /out direction is the Z direction of the part (along the coordinate system used during the part definition)
Tool direction
The lead in /out direction is the tool direction. For a digit start it's the direction of the bottom point.
Tip direction
The lead in /out direction is the probe direction.
For a simple probe (like a ball touch) this direction is the same as the "Tool direction"
For a digit star, the direction is the direction of the used point.
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