Gray line in flight plans

Hello, when MSFS2020 creates a flight plan somethimes I see a gray line next to blue line of the flight plan.
Why does it happen? What is the use of this gray line?

The Gray line is to show you “alternate paths” that you can choose. It may use a different SID, or STARs, or even navigate through a different airways and waypoints. You can click on them and they will become the blue line or the “active path” that you have selected.

Thank you for your answer

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