problems with -fdump-tree options (gcc 4.1.2)

[Tony Zhang]

Hi,
I tried the following:
gcc-fdump-tree-all example.c,

and i got these files:
example.c.t00.tu ,
example.c.t02.original ,
example.c.t03.gimple ,
example.c.t06.vcg ,
....
I have two questions:
How can i get example.c.original rather than example.c.t02.original? 
What does the symbol "t0x" stand for?

Thanks a lot!
Tony.