This file is indexed.

/usr/lib/R/site-library/knitr/themes/aiseered.css is in r-cran-knitr 1.17-2.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

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.background {
  color: #600000;
}
.num {
  color: #88ddee;
}
.str {
  color: #ffcc88;
}
.com {
  color: #ffffff;
  font-style: italic;
}
.opt {
  color: #ffcc33;
}
.std {
  color: #f08080;
}
.kwa {
  color: #eeff99;
  font-weight: bold;
}
.kwb {
  color: #88ffaa;
}
.kwc {
  color: #aa99ff;
}
.kwd {
  color: #f0b77f;
}