can not understand the scale of H_g2gflat

Hi: I find one example of H_g2gflat: [1, 0, 0, 0] [0, 1, 0, 0] [0, 0, 0.472, 0] https://github.com/OpenPerceptionX/PersFormer_3DLane/blob/main/data/Load_Data.py#L417

but I cannot understand what's the scale(0.472) stand for Thanks!