PdfContentByte qQ

Hi, I have a couple of questions about the lower level operations of
PdfContentByte.

Firstly, I've noticed that when I create a new PdfContentByte (using
GetUnderContent from PdfStamper)
the new PdfContentByte always appends q (save state) and Q (restore
state) to the end of itself. Why does it do this?

Secondly, what is the CTM if you restore state (Q) back to the first q
from the first content stream?

Cheers,

Billy

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