This file is indexed.

/usr/share/xscreensaver/config/phosphor.xml is in xscreensaver-data-extra 5.34-2ubuntu1.

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

The actual contents of the file can be viewed below.

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<?xml version="1.0" encoding="ISO-8859-1"?>

<screensaver name="phosphor" _label="Phosphor">

 <command arg="-root"/>

  <video href="http://www.youtube.com/watch?v=G6ZWTrl7pV0"/>

 <hgroup>
  <vgroup>
   <number id="delay" type="slider" arg="-delay %"
           _label="Frame rate" _low-label="Low" _high-label="High"
           low="0" high="100000" default="50000"
           convert="invert"/>

   <number id="scale" type="spinbutton" arg="-scale %"
           _label="Font scale" low="1" high="20" default="6"/>

   <number id="fade" type="slider" arg="-ticks %"
           _label="Fade" _low-label="Slow" _high-label="Fast"
           low="1" high="100" default="20"
           convert="invert"/>

   <select id="fg">
    <option id="green" _label="Green" />
    <!-- DarkOrange is probably the closest named color. -->
    <option id="DarkOrange" _label="Amber" arg-set="-fg #ff7900" />
    <option id="white" _label="White" arg-set="-fg white" />
   </select>

   <boolean id="showfps" _label="Show frame rate" arg-set="-fps"/>
  </vgroup>
  <vgroup>
   <xscreensaver-text />
  </vgroup>
 </hgroup>

  <xscreensaver-updater />

  <_description>
An old terminal with large pixels and long-sustain phosphor.

On MacOS and Linux, this program is also a fully-functional VT100
emulator!  Run it as an application instead of as a screen saver and
you can use it as a terminal.

Written by Jamie Zawinski; 1999.
  </_description>
</screensaver>