The index is determined by the order of the detections in the union catalogue. The matching entries in the individual catalogues have the same index to facilitate cross-referencing.

The names are in the format PSZ2 Gxxx.xx ± yy.yy where xxx.xx is the Galactic longitude and ±yy.yy is the Galactic latitude of the detection, both in degrees. The coordinates are truncated towards zero, not rounded.

The value given here is the 95% confidence interval of the distribution of radial displacement.

The PIPELINE column defines the pipeline from which the values in the union catalogue are taken: 1 = MMF1; 2 = MMF3; and 3 = PwS. The PIPE_DET column is used to indicate which pipelines detect this object. The three least significant decimal digits are used to represent detection or non-detection by the pipelines. Order of the digits: hundreds = MMF1; tens = MMF3; and units = PwS. If it is detected then the corresponding digit is set to 1, otherwise it is set to 0.

The neural network quality flag is 1-Q_bad, following the definitions in Aghanim et al. (2015). Values Q_NEURAL < 0.4 denote low-reliability detections.

The VALIDATION column gives a summary of the external validation, encoding the most robust external identification: –1 = no known external counterpart; 10 = ENO follow-up; 11 = RTT follow-up; 12 = PanSTARRs; 13 = redMaPPer non-blind; 14 = SDSS high-z; 15 = AMI; 16 = WISE; 20 = legacy identification from the PSZ1 2013 release; 21 = MCXC; 22 = SPT; 23 =ACT; 24 = redMaPPer; 25 = PSZ1 counterpart with redshift updated in Planck Collaboration XXXII (2015); and 30 = NED.

The redshift source is the most robust external validation listed in the VALIDATION field.

Definition of M_SZ. The hydrostatic mass, M₅₀₀, assuming the Y–M scaling relation of Eq. (7) of Planck Collaboration XX (2014) as a prior that cuts a plane through the parameter contours (see Sect. 5.3). The assumed cosmology for this calculation h = 0.7, Ω_m = 0.3 and Ω_Λ = 0.7. The errors are 67% confidence statistical errors and based on the Planck measurement uncertainties only. Not included in the error estimates are the statistical errors on the scaling relation, the intrinsic scatter in the relation, or systematic errors in data selection for the scaling relation fit.

The WISE confirmation flag is assigned by visual inspection and defined to be one of [−10,−2,−1,0,1,2,3 ], where –10 denotes no information and the other values are discussed in Sect. 7.4. The Bayesian evidence for the AMI counterpart is defined in Sect. 7.5.3.