In Figure 3a, each residue has its own local coordinates, which are illustrated shown using different colors.
Here are two more papers:
By global coordinate, I understand the coordinate system in which we view the entire protein chain.
What does it generally (not only in this particular paper) mean by a Local Coordinate in the case of protein chains?
Why was it necessary to introduce this terminology when they could have just used the term "vector"?
Can you supply me with an example with an explanatory diagram?