9.19.3 Can you answer these questions?

9.19.3.1 \NewDocumentCommand embellishments/tokens syntax

https://tex.stackexchange.com/landing/r/digest?cta=question&id=679800

Edited: David Carlisle kindly provided the answer in a comment, which is the definition after \makeatletter. 
I'm trying to use embellishments in \NewDocumentCommand to define a macro to kern ... 
[xparse] [arguments]
 

asked by John Bourke https://tex.stackexchange.com/landing/r/digest?cta=user&id=245172 Score of 1

answered by egreg https://tex.stackexchange.com/landing/r/digest?cta=user&id=4427 Score of 0

9.19.3.2 How to change the default momentum arrow settings in TikZ-Feynman

https://tex.stackexchange.com/landing/r/digest?cta=question&id=679970

I'm trying to change the color of every momentum arrow in Feynman diagrams generated with tikz-feynman. 
You can customize each momentum arrow individually like this: 
\documentclass[convert]{standalone}... 
[luatex] [tikz-feynman]
 

asked by Jack https://tex.stackexchange.com/landing/r/digest?cta=user&id=293255 Score of 1

answered by samcarter_is_at_topanswers.xyz https://tex.stackexchange.com/landing/r/digest?cta=user&id=36296 Score of 0

9.19.3.3 How to move headers from the top to the bottom of the page and insert a logo at the right top of each document page?

https://tex.stackexchange.com/landing/r/digest?cta=question&id=679997

I am using the code below to develop a course syllabus. I tried different approaches without success to add an image at the top right of each document page and simultaneously move the header that ... 
[graphics] [header-footer]
 

asked by Davi Moreira https://tex.stackexchange.com/landing/r/digest?cta=user&id=15121 Score of 1

answered by Davi Moreira https://tex.stackexchange.com/landing/r/digest?cta=user&id=15121 Score of 0