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entryCSN format

Forgive my question - I am a newcomer to OpenLDAP....
I am trying to understand the format of entryCSN.
Here's a sample value retrieved from an ldapsearch -
entryCSN: 2003101016:50:18Z#0x0001#0#0000
In the above,
2003101016:50:18Z - seems to be the timestamp
0x0001 - seems to be the actual change sequence number (which changes for every modification)
What do the remaining 2 sections (#0#0000) stand for : For all entries added so far - I see it is #0#0000
Also, If I were to use the entryCSN to determine the changes made to entries, how can I determine deletions  - is there a notion of tombstone in OpenLDAP ?