/etc/X11/xdm/Xservers is in xdm 1:1.1.11-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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# Xservers file, workstation prototype
#
# This file should contain an entry to start the server on the
# local display; if you have more than one display (not screen),
# you can add entries to the list (one per line). If you also
# have some X terminals connected which do not support XDMCP,
# you can add them here as well. Each X terminal line should
# look like:
# XTerminalName:0 foreign
#
# When adding X servers, please keep the following things in mind:
# - If the X server's number is not zero, it must be passed to the X
# server's command line as its first argument.
# - When using the Xorg X server, it is wise to add the vtXX
# option to each local X server, since this is the only sure way
# of knowing in advance which X server attaches to which virtual
# console.
# - SECURITY NOTE: Always pass the "-nolisten tcp" option to the X
# server, as shown in the examples below, unless you know you
# need the X server listening on a TCP port. Omitting this
# option can expose your X server to attacks from remote hosts.
# Note also that SSH's X11 port-forwarding option works even with
# X servers that do not listen on a TCP port, so you do not need
# to remove the "-nolisten tcp" option for SSH's benefit.
# - See the Xserver(1) manpage for a description of X server
# options. If you are using the Xorg X server, see the
# Xorg(1) manpage for a description of options specific to it
# (such as "-depth").
#
# Examples for multiple local X displays:
# :0 local /usr/bin/X :0 vt9 -depth 15 -nolisten tcp
# :1 local /usr/bin/X :1 vt10 -depth 8 -nolisten tcp
:0 local /usr/bin/X :0 vt7 -nolisten tcp
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