/usr/share/plplot5.9.9/cmap0_white_bg.pal is in libplplot11 5.9.9-2ubuntu2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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#ffffff 1.0
#ff0000 1.0
#ffff00 1.0
#00ff00 1.0
#7fffd4 1.0
#ffc0cb 1.0
#f5deb3 1.0
#bebebe 1.0
#a52a2a 1.0
#0000ff 1.0
#8a2be2 1.0
#00ffff 1.0
#40e0d0 1.0
#ff00ff 1.0
#fa8072 1.0
#000000 1.0
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