Help on EDEM API Accessing Meta-Particle Length

I have been working on developing an API to export the meta-particle length to a local file before removing each meta-particle from the computing domain. While I’m able to access the radius for each single particle, I have difficulty in obtaining the meta-particle length in API. Can anyone please show me how to access the properties of meta-particle in API?

By the way, the API I’m developing is based on the API example from Knowledge Base (Script & Model Library - EDEM API - Contact Model Example: Removing Particles (Altair Knowledge Article View - Altair Community)). 

Thank you!