Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
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A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.
Critical Bottleneck in circuit. Pathway where the flow has to go from left to right (black arrow). * Indicates the critical bottleneck. Bypass A will relieve flow obstruction, while B will have no effect on flow distal to the bottleneck. See the text for details
