What does the SWAP column in top command stand for?

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how to find out which processes are swapping in linux?

I gave the top command and sorted the output using the sort below field.

P: SWAP = Swapped size (kb)

I was looking for the process id which was consuming the maximum amount of swap.

Here is the output I got

SWAP COMMAND

1.1g java
979m java
568m java

What does this mean? It does not seem to be the swap space used by these processes because at the start of the top command output the Swap detail is given as

Swap: 2096440k total, 830636k used,

The total amount of swap is 1.99g so the first three processes cannot consume so much. So what does this column exactly stand for?

Additionally, is there a way to hunt down a process which is consuming high swap space?

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