The Abell 370 Pilot-WINGS master data catalogue README/Description of columns

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Column        Description
iden          A numerical identifier (typically matched to a SExtractor
	      detection run) for each galaxy. (see Note A)
    
idfrom        An indication of how the object was detected. "PRIOR" sources are
	      identified in broadband (HST) images, while "MUSELET" sources are
	      only seen in the MUSE data. "EXTERN" objects are manually added
	      to the catalogue, in cases where an object is known but not
	      detected by either method (e.g., a member of a multiply-imaged
	      system that is very faint or highly contaminated by a bright
	      neighbour.) (see Note A)

Field	      The data set containing the galaxy. "CORE" objects are located in
	      the core region of the cluster, which is covered by deep MUSE
	      data, while ``Pxx'' objects are found in the shallower outskirts
	      regions. (see Note A)

RA	      Object Right Ascension (J2000), aligned to Gaia DR2 WCS.

DEC	      Object Declination (J2000), aligned to Gaia DR2 WCS.

z	      The measured redshift of each object.
    
zconf	      An assessment of the reliability of the redshift measurement,
	      from low (zconf=1) to high (zconf=3). (See Note B)
    
FxxxW	      The measured flux of the object in a given HST band (F435W, F606W,
	      F814W, F105W, F125W, F140W, and F160W) reported in AB apparent
	      magnitudes. (See Note C)

FxxxW_err     The flux uncertainty, measured in AB apparent magnitudes. 
    
MUL	      If the object is part of a multiply-imaged system, this column
	      provides a unique identifier for each image. Numbering is taken
	      from the lensing catalogue presented in Lagattuta et al., 2019
	      (2019MNRAS.485.3738L)

#####Notes#####

Note A: While individual iden numbers can be repeated between objects in
        different datasets or detection methods, a given (iden + idfrom + Field)
	combination is entirely unique for all galaxies in the catalogue.

Note B: zconf measurements are classified as follows:
        *Confidence 1: the redshift is based on a single ambiguous or low-SNR
	 emission line, or several low SNR absorption features.
        
        *Confidence 2: the redshift is based on a single emission line without
	 additional information, several moderate S/N absorption features, or a
	 Confidence 1 detection whose redshift confidence is increased by the
	 identification of a multiply-imaged system.
        
        *Confidence 3: the redshift is based on multiple clear spectral
	 features, or on a single high S/N emission line  with additional
	 information (e.g., an obvious asymmetry in the line profile or a
	 clear non-detection in HST bands bluewards of the line).

Note C: Magnitudes that appear as negative numbers are non-detections and
        should be treated as upper-limits on the flux estimate.