[ADMIN] pgsql database .1 .2 .3 file names

[Bryan Biggers]

Can anyone tell me what the data file names with the .1 .2 .3 etc. 
extensions are? Are these undo versions of my tables or something? I 
need to recover some disk space and I'm wondering if I need them. Here 
is an example...
-rw-------    1 postgres postgres 1073741824 Oct 18 20:01 19523580
-rw-------    1 postgres postgres 1073741824 Sep  6 20:11 19523580.1
-rw-------    1 postgres postgres 1073741824 Sep  6 20:11 19523580.2
-rw-------    1 postgres postgres 1073741824 Sep  6 20:11 19523580.3
-rw-------    1 postgres postgres 1073741824 Sep  6 20:11 19523580.4
-rw-------    1 postgres postgres 1073741824 Oct  6 20:19 19523580.5
-rw-------    1 postgres postgres 629948416 Oct 19 12:33 19523580.6


Thanks, Bryan

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