http://i3xi5qxvbrngh3g6o7czwjfxwjzigook7zxzjmgwg5b7xnjcn5hzciad.onion/print.html
Note that as of 2023,
the specifications do not perfectly distinguish
between relay cells and relay messages.
This is because, until recently,
there was a 1-to-1 relationship between the two:
every relay cell held a single relay message.
As proposal 340 is implemented,
we will revise the specifications
for improved clarify on this point.