Figure A3.
Fourier transforms of one-second time traces taken using a Bartington MAG690 magnetometer in (a) shielded and (b) unshielded conditions.
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.