# Instrument Paper Comment

### LATEX style

1. Bunch of \newcommand (and similar) defined after \begin{document} in the cmbs4_instbook.tex, although it doesn't seem to cause any failures, it feels like many of those commands should live in the preamble. See for example the ADS abbreviations. It would be useful to clean up this file to improve readability. I think it generally makes it easier for people to contribute to the document.

### Telescope design

1. Table 2-1: BICEP array info need to be added

1. The beginning of section 3.6 has a long, useful introduction. Sections 3.5 and 3.7 are much more terse. I kinda liked the 3.6 intro...
2. Throughout; inconsistent use of \sim and \approx for rough #s.

### Focal plane optical coupling

1. The hyphenation usage is still a mess: band-width, bandwidth, band with, is one example, but there are many more.
2. The use of the oxford comma is inconsistent
3. Is it “a” with bandwidth ratio (e.g., "3:1 bandwith ratio” or “a 3:1 bandwidth ratio”)?
4. capture CLASS technology correctly (waiting for input)

### Focal plane sensor and readout

1. A statement in the introduction on detectors and readout which claimed MKIDs would not need a lot of development for implementation in S4. I believe this was written in the context of multiplexing and not sensing. This needs rewording