This file is indexed.

/usr/share/postgresql/9.5/timezonesets/Atlantic.txt is in postgresql-9.5 9.5.14-0ubuntu0.16.04.

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

The actual contents of the file can be viewed below.

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#
# NOTE:
#   This file is NOT loaded by the PostgreSQL database.  It just serves as
#   a template for timezones you could need.  See the `Date/Time Support'
#   appendix in the PostgreSQL documentation for more information.
#
# src/timezone/tznames/Atlantic.txt
#

ADT    -10800 D  # Atlantic Daylight Time
                 #     (America/Glace_Bay)
                 #     (America/Goose_Bay)
                 #     (America/Halifax)
                 #     (America/Thule)
                 #     (Atlantic/Bermuda)
# CONFLICT! AST is not unique
# Other timezones:
#  - AST: Arabic Standard Time (Asia)
#  - AST: Al Manamah Standard Time (Asia) same offset as Arabia Standard Time
#  - AST/ACT: Acre Standard Time (America) listed as ACT
#  - AST: Anguilla Standard Time (America) same offset
#  - AST: Antigua Standard Time (America) same offset
#  - AST: Antilles Standard Time (America) same offset
AST    -14400    # Atlantic Standard Time
                 #     (America/Anguilla)
                 #     (America/Antigua)
                 #     (America/Aruba)
                 #     (America/Curacao)
                 #     (America/Dominica)
                 #     (America/Glace_Bay)
                 #     (America/Goose_Bay)
                 #     (America/Grenada)
                 #     (America/Guadeloupe)
                 #     (America/Halifax)
                 #     (America/Martinique)
                 #     (America/Montserrat)
                 #     (America/Port_of_Spain)
                 #     (America/Puerto_Rico)
                 #     (America/Santo_Domingo)
                 #     (America/St_Kitts)
                 #     (America/St_Lucia)
                 #     (America/St_Thomas)
                 #     (America/St_Vincent)
                 #     (America/Thule)
                 #     (America/Tortola)
                 #     (Atlantic/Bermuda)
AZOST       0 D  # Azores Summer Time (obsolete)
AZOT    -3600    # Azores Time (obsolete)
CVT     Atlantic/Cape_Verde  # Cape Verde Time (obsolete)
FKST    Atlantic/Stanley  # Falkland Islands Summer/Standard Time (obsolete)
FKT     Atlantic/Stanley  # Falkland Islands Time (obsolete)
GMT         0    # Greenwich Mean Time
                 #     (Africa/Abidjan)
                 #     (Africa/Bamako)
                 #     (Africa/Banjul)
                 #     (Africa/Bissau)
                 #     (Africa/Conakry)
                 #     (Africa/Dakar)
                 #     (Africa/Lome)
                 #     (Africa/Monrovia)
                 #     (Africa/Nouakchott)
                 #     (Africa/Ouagadougou)
                 #     (Africa/Sao_Tome)
                 #     (America/Danmarkshavn)
                 #     (Atlantic/Reykjavik)
                 #     (Atlantic/St_Helena)
                 #     (Etc/GMT)
                 #     (Europe/Dublin)
                 #     (Europe/London)
# CONFLICT! GST is not unique
# Other timezones:
# - GST: Gulf Standard Time (Asia)
GST     -7200    # South Georgia Time (Atlantic) (obsolete)
WEST     3600 D  # Western Europe Summer Time
                 #     (Atlantic/Canary)
                 #     (Atlantic/Faeroe)
                 #     (Atlantic/Madeira)
                 #     (Europe/Lisbon)
WET         0    # Western Europe Time
                 #     (Africa/Casablanca)
                 #     (Africa/El_Aaiun)
                 #     (Atlantic/Canary)
                 #     (Atlantic/Faeroe)
                 #     (Atlantic/Madeira)
                 #     (Europe/Lisbon)