/var/lib/tex-common/fontmap-cfg/texlive/texlive-science.cfg is in texlive-science 2017.20180305-2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 | Map chemarrow.map
MixedMap stmaryrd.map
MixedMap yhmath.map
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