Lidar Sensors used in Beta_v0 vs Beta++

I assume that both sensor configurations (BETA++ and BETA_v0) were used in the dataset. I'm interested in the roof lidar which was changed from 40-beam to 64-beam. I have two questions:

1. What is the data split between Beta++ and Beta_v0?
2. For the 64-beam roof lidar, what lidar model are they using? (pandar64, velodyne, etc.)

Thanks in advance for the help.