8.61.3 Can you answer these questions?

8.61.3.1 Trouble formatting a part heading
8.61.3.2 There's xcomb and ycomb in pgfplots, but is there something like an xycomb?
8.61.3.3 Trying to compile a book written 2011 from files sent by publisher
8.61.3.1 Trouble formatting a part heading

https://tex.stackexchange.com/landing/r/digest?cta=question&id=657675

So, I'm trying to format the heading for a Part of a book. This heading is to include a quote and an author. As this is likely code that I'll want to reuse (and in the main body of the text as well), ... 
[parts] [center] [format]
 
asked by JRCSalter https://tex.stackexchange.com/landing/r/digest?cta=user&id=278422 Score of 1
answered by egreg https://tex.stackexchange.com/landing/r/digest?cta=user&id=4427 Score of 0
8.61.3.2 There's xcomb and ycomb in pgfplots, but is there something like an xycomb?

https://tex.stackexchange.com/landing/r/digest?cta=question&id=657559

I'm trying to produce something like the figure below but in 3D so that I can plot discrete point mass functions. The only example I could find in the pgfplots manual is on page 111, but I couldn't ... 
[pgfplots]
 
asked by TonyK https://tex.stackexchange.com/landing/r/digest?cta=user&id=257015 Score of 1
answered by Black Mild https://tex.stackexchange.com/landing/r/digest?cta=user&id=140722 Score of 0
8.61.3.3 Trying to compile a book written 2011 from files sent by publisher

https://tex.stackexchange.com/landing/r/digest?cta=question&id=657562

In response to a request to a publisher for a pdf version of a 2011 book I purchased, the publisher sent me collection of three folders: one containing .tex files for each of the chapters, as well as .... 
[book-design]
 
asked by David Romano https://tex.stackexchange.com/landing/r/digest?cta=user&id=280248 Score of 1