/usr/include/sp/NCVector.sed is in libsp1-dev 1.3.4-1.2.1-47.3.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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// This file is automatically generated. Do not edit!
s/Vector/NCVector/g
s/^#ifdef NC$/#if 1/
s/^#ifndef NC$/#if 0/
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