The MEE's integrity tree does not reside in the EPC. A small part of the tree resides on the processor die, and most of it resides in a seized area of DRAM. Please see this paper for an in-depth description of the MEE.
Thanks for your quick reply.
Now, I understood that most of the MEE's integrity tree portion resides in the Processor Reserved Memory region (seized) outside the EPC.
In addition to this thread, I have one more question.
Q. Other than holding the EPC and enclave metadata like (MEE's integrity tree), What are the other use-case of PRM?