What is ENDC mode 0, 1, 2 and 3?

5G NR
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1

Hi All.
What is ENDC mode 0, 1, 2 and 3?
Anyone has NSA call flow of NR to NR handover image?

2

These are Samsung specific terminologies I guess.
Basically these are sgNB addition types like blind, based on buffer, coverage etc.