PS: because the document is really long, I ask everyone on the WP2 list to read at least 3 or 4 pages. That way we can split the burden a bit and make it not too overwhelming. This should be doable given the amount of people that are signed up for WP2.

Sebastiaan

From: haffert@strw.leidenuniv.nl haffert@strw.leidenuniv.nl Sent: Friday, 23 October 2026 10:45 To: pcs-wp2@strw.leidenuniv.nl Subject: [Pcs-wp2] Starting to review WP4

Hi all,

We have received the documents from Markus to review. I have attached the WP4 documentation.

Please follow the instructions and write all your comments in the following document:

https://docs.google.com/document/d/1dXSu7lVKjrYF7SgCKPUJs7e3FUWAI4q1AWDsPLco...

Please finish this by Tuesday, 27 October, end of day. Only Axel and I have access to JIRA, and we need to fill in all your comments. So, we need the time on the 28th to do that.

Met vriendelijke groet / With kind regards,

Dr. Sebastiaan Haffert

Assistant professor

Leiden Observatory, Leiden University

Einsteinweg 55, 2333 CC, Leiden, The Netherlands