Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.
(a) Singularity spectra computed from reported measles incidence in Ontario, Canada (ON), London, UK (LON), Liverpool, UK (LPL), and Baltimore (BALT) in the USA. wk and mn refer to weekly and monthly data, respectively. (b) The associated scaling functions. (Online version in colour.)
