About actually reading the summary modeline

[Harry Putnam]

I've been browsing the gnus manual looking for something that will tell
me how to read the summary modeline.

I found all the details about the elements that can be used to create
the mode line... I need something that shows some examples of what
they really do... that is, what they look like in practice.

Trying to guess what a couple of them mean is not working for me.
Some things seem almost inexplicable... that bit in Curly brackets
that says '{SomeNumber more}'

  or

`{1798  more}'

The ones I can tell right off are the line counter, the percentage
figure (43%) Plugged or not

What I see looks like this:
(Understand, of coures, it is all on one line ... beginning at U:---
and ending with `(Summary Plugged))

 U:---  PicOfGnu - newsgroup(abbreved) [46355]  {2757  more} 61%
 (33661,23)  (Summary Plugged)

"[46355]" "{2757  more}"  43% (33661,23) (Summary Plugged)

What do those two in [double quotes added by me ]on line above
represent?