https://docs.unity3d.com/es/2017.2/ScriptReference/Keyframe-outTangent.html
Keyframe-outTangent - Unity Scripting API
Describes the tangent when leaving this point towards the next point in the curve.
keyframeunityscriptingapi
https://docs.unity3d.com/2019.1/Documentation/ScriptReference/Keyframe-outTangent.html
Unity - Scripting API: Keyframe.outTangent
scripting apiunitykeyframe