What is the meaning of parameter 'traj_scale'?

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Hello Author! I am very interested in your wonderful research. In the test part of code, during calculating 'distance' values, there multiplies a parameter 'traj_scale', which confused me a lot. Could you please explain the meaning of this parameter? Thank you very much for your research. https://github.com/MediaBrain-SJTU/LED/blob/b606ca99c1e3e5f361657964f5be036c1222719a/trainer/train_led_trajectory_augment_input.py#L347C4-L347C4