This file is indexed.

/etc/astnoisechisel.conf is in gnuastro 0.5-1.

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

The actual contents of the file can be viewed below.

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# Default parameters (System) for NoiseChisel.
# NoiseChisel is part of GNU Astronomy Utitlies.
#
# Use the long option name of each parameter followed by a value. The name
# and value should be separated by atleast one white-space character (for
# example ` '[space], or tab). Lines starting with `#' are ignored.
#
# For more information, please run these commands:
#
#  $ astnoisechisel --help               # Full list of options, short doc.
#  $ astnoisechisel -P                   # Print all options and used values.
#  $ info astnoisechisel                 # All options and input/output.
#  $ info gnuastro "Configuration files" # How to use configuration files.
#
# Copying and distribution of this file, with or without modification, are
# permitted in any medium without royalty provided the copyright notice and
# this notice are preserved.  This file is offered as-is, without any
# warranty.

# Input:
 khdu                 1
 wkhdu                1
 convolvedhdu         1
 minskyfrac         0.7
 minnumfalse        100

# Tessellation
 largetilesize  200,200

# Detection:
 mirrordist         1.5
 modmedqdiff       0.01
 qthresh            0.3
 qthreshtilequant   1.0
 smoothwidth          3
 erode                2
 erodengb             4
 noerodequant    0.9331
 opening              1
 openingngb           8
 sigmaclip        3,0.2
 dthresh            0.0
 detsnminarea        10
 detquant          0.95
 detgrowquant      0.70
 detgrowmaxholesize 100

# Segmentation
 segsnminarea        15
 keepmaxnearriver     0
 segquant          0.95
 gthresh            0.5
 minriverlength      15
 objbordersn          1

# Operating mode
 continueaftercheck   0