Figure 1.
Overview of set-up for implementing the SPARK protocol when there are only three sites. This figure is only reproduced in colour in the online version.
Official websites use .gov
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.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.