Why setting specific intervals rather uniformly distributed intervals of the inclination to collect lidar points when simulating a low-resolution lidar?

[qq1018408006]

感谢您的杰出工作。
我有一个问题，关于在论文正文中提到的采集4个特定俯仰角区间中的点来模拟4线的激光雷达，这4个区间的位置和长度是如何确定的呢？

For 4-beam LiDAR, we select beams whose inclination θ fall within [−7.1◦, −5.8◦] ∪ [−4.5◦, −3.2◦] ∪ [−1.9◦, −0.6◦] ∪ [0.7◦, 2.0◦].