I got a question about the MSA on Jeppesen arrival plate (RCTP 20-2). The MSA circle  was divided into three sectors with three altitude before:

[![enter image description here][1]][1]  

... but I found that it becomes only one altitude (not divided anymore) on the new version:

[![enter image description here][2]][2]  

I've been looking for the reason for a long time but still can't figure it out. Does anyone know why they did such the change?


  [1]: https://i.sstatic.net/dVrGJ.jpg
  [2]: https://i.sstatic.net/q9Ufs.jpg
  [3]: https://imgur.com/WgpiW0S
  [4]: https://imgur.com/sW3IYhd