IWR6843ISK: Regarding OOB heatmap in 60 GHz

Hi TI Team,

With reference to the ticket below:

https://e2e.ti.com/support/sensors/f/1023/p/948950/3527207#3527207

We would like to know what is parameter mentioned in below graph as z e.g. (z = 3427).  what does that mean?

can we get reference code to do our custom heatmap plot generation? 

Thanks

Shraddha