Contact

Corrections, licensing, questions

Three things reach us here: licensing one of the figures, a question about how these guides are written, and — the one we most want — telling us a number is wrong.

If a number here is wrong

Say which page and which figure. Every number our tools and diagrams draw is published with the sentence it was read from, and that ledger is downloadable — so for those, a correction can usually be settled by pointing at the source rather than by argument. The guides carry numbers beyond the ledger too, and those are cited in the reference list at the foot of each page. If the paper disagrees with us, the paper is right.

Licensing a figure

The figures are free to use commercially with a visible credit link. What is sold is removing that requirement. Tell us which figure, or that you want the set, and what it is going on.

Get in touch

Licensing a figure, asking about the method, or telling us a number is wrong — all of it arrives the same way. This form posts to this site's own server; there is no third party in it.

What is this about?

Licensinga figure, the set, or a tool Press or researcha question about the sources or the method A correctionsomething here is wrong or out of date Something else

Your email address

Only so there is somewhere to reply to.

Your message

What happens to it: your message, your address and the time are stored in a database on this server, outside the public web root, and read by a person. Nothing is passed to anyone else. Your IP is not kept beside the message; it is recorded separately for an hour so one connection cannot flood this form, and then deleted. Sent over HTTPS, which protects it in transit — not after that. We are not going to promise a reply time we cannot keep, and a correction is often acted on rather than answered. What we store.