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ESO Phase 3 Data Release Description

Please start from this template when preparing the documentation for your
ESO Phase 3 data release. Guidelines regarding structure and content are
provided below depending on the type of data (imaging, spectroscopy,
scientific catalogue, et cetera). After having addressed each question,
please completely remove the guideline text (italic style), this paragraph
inclusive. The completed release description must constitute a self-
consistent document in Portable Document Format (PDF) including all
figures, plots and tabular information as needed. The final PDF file, to be
named "release-description.pdf", must be uploaded to the release directory
of the Phase 3 FTP area before closing the release. The release description
document forms an integral part of any ESO data release. It is essential
for the data content validation carried out by the Archive Science Group
before integrating the data with the ESO archive. Finally, the release
description will be published as submitted - without further editing by ESO
- to support the user community in utilizing the data.

|Data Collection | |
|Release Number | |
|Data Provider | |
|Date | |


Abstract

Short, broad overview of the data being released. Please refer to ESO
programme, instrument, observational setup, filters/bands used, total sky
coverage, number of epochs, resolution, if applicable. The scientific
context may be touched as well. Please indicate if this is a catalogue data
release.


Overview of Observations

Brief summary of the observations this data release is based upon. In case
of imaging observations and surveys: the field layout with an indication of
the set of bands used for each field, preferably with finding chart or
display of the covered fields/objects. In case of spectroscopy, please
provide finding charts if possible.


Release Content

List of imaging data products including field designation/target object,
J2000 coordinates, filter, exposure time, observing date, seeing and
limiting magnitude. Analogously, for spectroscopic data products, please
list target name, J2000 coordinates, spectral range, resolution, exposure
time, observing date and signal-to-noise ratio.
If the file list is very long, as for instance in the case of surveys,
please provide a summary including the distribution of key parameters like
seeing and limiting magnitude if possible. Please specify the total number
of data files in any case.
In case of catalogue data, please provide a general description of the
content in terms of the catalogue parameters and the selection criteria
applied. The following topics should be addressed in particular.
. Sky region covered by the data. Any gaps?
. Please specify the total area, e.g. in square degrees.
. Spectral band used for detection, or was a multi-band detection image
("chi-square image") used?
. Limiting magnitude of the source catalogue and the corresponding
statistical significance of the faintest sources (e.g. 10 ?). Is the
limiting magnitude uniform across the survey area?
. What is the total number of sources, or, more generally, catalogue
records? What is the total data volume (megabytes)?


Release Notes

Short descriptions of the reduction methods used, the calibration
procedures (astrometric, photometric, wavelength etc.), characterization of
the data quality, and a comparison with previous releases where applicable.


Data Reduction and Calibration

Please address the following questions for scientific catalogue data,
particularly in case of source catalogues:
. Which source detection method was used to generate the catalogue? Has
the image been filtered before detection? Pls. specify the detection
parameters (threshold, min. area, etc.)
. How were very bright stars, and imaging artifacts resulting thereof,
handled?
. Illustrate the screening procedure that was followed to remove
spurious sources and artifacts from the catalogue.
. Describe the process of merging overlapping survey tiles into one
unique source catalogue (in case of surveys).
. Which reference was used to establish the astrometric calibration
(GSC1, GSC2, USNO, 2MASS catalogue)?
. Specify the photometric reference system. Which procedure has been
adopted to establish a global photometric calibration for surveys?
. Has the illumination effect been corrected for? If yes, what has been
corrected, image pixels or source fluxes?
. Which corrections were applied to photometric measurements to account
for seeing variations (e.g. aperture corrections, PSF matching)?
. Discuss the loss of flux due to finite apertures and the estimation of
total flux for point sources.
. Discuss the effect of intergalactic extinction. Have fluxes/magnitudes
been corrected for reddening?

Data Quality

Outline of the quality checks that were carried out on the data, including
a discussion of the following topics (when applicable):
. Uniformity of the astrometric calibration across the survey region.
Are there residuals due to individual detector chips or the tiling
scheme of the survey?
. Is the zeropoint uniform across the tile/image? Discuss residuals due
to chip-to-chip variations and the illumination effect.
. Uniformity of photometric calibration across the survey region, across
different filters, and between different epochs. Quality of the
colours indices?
. Quality of source parameters for point sources versus extended
sources.
. Contamination of the source catalogue. What is the fractional amount
of spurious objects at the faintest flux level?
. Quantification of catalogue completeness.

Known issues

if any

Previous Releases

This section only applies to subsequent releases having release numbers >1.
Please quote the release numbers of previous Phase 3 releases for this data
collection and list the changes in this release (N) with respect to the
immediately preceding data release (N-1).

Data Format


Files Types

Description of the types of files in this release and the file naming
conventions used.

Catalogue Columns

Please list label, data format, and description for each catalogue column.


Acknowledgements

Put here the acknowledgments to be included when using this data, usually
referring to the scientific publication associated with the data,
supplemented by the following boilerplate.

Please use the following statement in your articles when using these data:
Based on data products from observations made with ESO Telescopes at the La
Silla Paranal Observatory under programme ID PPP.C-NNNN(R).