/var/lib/pcp/config/pmchart/Schemes is in pcp-gui 1.5.11.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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version 1
scheme Fire #f2b600 #ede200 #d21005 #e4d904 #f35241
scheme Nature #b4ff3a #d2954e #069806 #8b5f07 #08ed00
scheme Neon #ff34f9 #fffb00 #1df0ff #12ff01 #ffc800
scheme Ocean #f5dd85 #aaf5cb #4790f5 #bdcfcc #12cfa0
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