Data Model: eFEDS_VAC143_AGN181_CTP17_PipelineRedshift

General Description
The file eFEDS_VAC143_AGN181_CTP17_PipelineRedshift.fits is a compilation of eROSITA and SDSS data from the works by Brunner et al. (2022), Salvato et al. (2022), Liu et al. (2022), and Almeida et al. (2023), with the data that was considered for the plots of Aydar et al. (2025). It contains data from 27369 point-like X-ray sources detected with eROSITA-DE (Brunner et al. 2022), their optical counterparts from public photometric data (Salvato et al. 2022),the results for the eROSITA X-ray analysis for the AGN in the sample (Liu et al. 2022), and the SDSS optical spectral follow-up, with the SDSS data described in Almeida et al. (2023) and previous data release papers of SDSS.
Naming Convention
Explain the file naming convention here. Filename:
eFEDS_VAC143_AGN181_CTP17_PipelineRedshift\.fits
Approximate Size
29 MB
File Type
FITS
Generated by Product
eSASS (software used to generate the date product, add links)

Sections

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HDU0: PRIMARY

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HDU Type
IMAGE
HDU Size
118 KB
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KeyValueTypeComment

HDU1: Joined

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HDU Type
BINARY TABLE
HDU Size
29 MB
Header Table Caption for HDU1
KeyValueTypeComment
Binary Table Caption for HDU1
NameTypeUnitDescription
ERO_Name char[22] None From Brunner et al. 22, eROSITA official source Name
ERO_ID_SRC int32 None From Brunner et al. 22, ID of eROSITA source in the Main Sample
ERO_RA_CORR float64 deg From Brunner et al. 22, J2000 Right Ascension of eROSITA source (cor
ERO_DEC_CORR float64 deg From Brunner et al. 22, J2000 Declination of eROSITA source (correct
ERO_RADEC_ERR_CORR float32 arcsec From Brunner et al. 22, eROSITA positional uncertainty (corrected)
ERO_ML_FLUX float32 erg/cm^2/s From Brunner et al. 22, 0.2-2.3 keV source flux
ERO_ML_FLUX_ERR float32 erg/cm^2/s From Brunner et al. 22, 0.2-2.3 keV source flux error (1 sigma)
ERO_DET_LIKE float32 None From Brunner et al. 22, 0.2-2.3 keV detection likelihood via PSF-fit
CTP_LS8_UNIQUE_OBJID char[11] None From Salvato et al. 22, LS8 unique id for ctp to the eROSITA source
CTP_LS8_RA float64 deg From Salvato et al. 22, Right Ascension of the LS8 counterpart
CTP_LS8_DEC float64 deg From Salvato et al. 22, Declination of the best LS8 counterpart
Dist_CTP_LS8_ERO float32 arcsec From Salvato et al. 22, Separation between ctp and eROSITA position
CTP_quality int16 None From Salvato et al. 22, ctp qual: 4=best,3=good,2=secondary,1/0=unre
SPECZ_N int32 None Total number of spec-z associated with this lsdr9 object
SPECZ_RAJ2000 float64 deg Coordinate of spec-z, propagated if necessary to epoch J2000
SPECZ_DEJ2000 float64 deg Coordinate of spec-z, propagated if necessary to epoch J2000
SPECZ_NSEL int32 None Number of spec-z selected to inform result for this object
SPECZ_REDSHIFT float32 None Final redshift determined for this object
SPECZ_NORMQ int32 None Final normalised redshift quality associated with this object
SPECZ_NORMC char[8] None Final normalised classfication determined for this object
SPECZ_HASVI bool None True if best spec-z for this object has a visual inspection
SPECZ_CATCODE char[12] None Catalogue code of best spec-z for this object
SPECZ_BITMASK int64 None Bitmask encoding catalogues containing spec-z for this object
SPECZ_SEL_BITMASK int64 None Bitmask encoding catalogues containing informative spec-z for object
SPECZ_FLAGS int32 None Bitmask encoding quality flags for this object
SPECZ_SEL_NORMQ_MAX int32 None Highest NORMQ of informative spec-z for this object
SPECZ_SEL_NORMQ_MEAN float32 None Mean NORMQ of informative spec-z for this object
SPECZ_SEL_Z_MEAN float32 None Mean REDSHIFT of informative spec-z for this object
SPECZ_SEL_Z_MEDIAN float32 None Median REDSHIFT of informative spec-z for this object
SPECZ_SEL_Z_STDDEV float32 None Standard deviation of REDSHIFTs for informative spec-z for object
SPECZ_ORIG_RA float64 deg Coordinate associated with individual spec-z measurement
SPECZ_ORIG_DEC float64 deg Coordinate associated with individual spec-z measurement
SPECZ_ORIG_POS_EPOCH float32 None Coordinate epoch associated with individual spec-z measurement
SPECZ_ORIG_LS_SEP float32 arcsec Distance from spec-z to lsdr9 photometric ctp (corrected for pm)
SPECZ_ORIG_LS_GT1CTP bool None Can spec-z be associated with >1 possible lsdr9 counterpart?
SPECZ_ORIG_LS_CTP_RANK int32 None Rank of ctp out of all possibilities for this spec-z (1=closest)
SPECZ_ORIG_ID_1 char[32] None Orig. value of ID of individual spec-z measurement (as a string)
SPECZ_ORIG_REDSHIFT float32 None Orig. redshift value of individual spec-z measurement
SPECZ_ORIG_QUAL char[8] None Orig. redshift quality value of individual spec-z measurement
SPECZ_ORIG_NORMQ int32 None Orig. redshift quality of individual spec-z measurement - normalised
SPECZ_ORIG_CLASS char[16] None Orig. classification label of individual spec-z measurement
SPECZ_ORIG_HASVI bool None True if individual spec-z has a visual inspection from our team
SPECZ_ORIG_NORMC char[8] None Normalised classification code of individual spec-z measurement
SPECZ_RA_USED float64 deg Adopted coordinate of specz when matching to Salvato+22 counterpart
SPECZ_DEC_USED float64 deg Adopted coordinate of specz when matching to Salvato+22 counterpart
Separation_SPECZ_CTP float64 arcsec Dist. from CTP_LS8_RA,CTP_LS8_DEC to SPECZ_RA_specz,SPECZ_DEC_specz
has_specz bool None Does this Salvato et al. 22 counterpart have a spec-z?
good_ctp bool None Expression: _8
dl10 bool None Expression: _9
sdss_specz bool None Expression: _11
others_specz bool None Expression: _12
goodz bool None Expression: _15
CTP_NWAY_LS8_UNIQUE_OBJID char[11] None LS8 Unique OBJECTID of the best LS8 countepart from NWAY (Expression
CTP_NWAY_LS8_RA float64 deg J2000 Right Ascension of the best LS8 countepart from NWAY
CTP_NWAY_LS8_DEC float64 deg J2000 Declination of the best LS8 countepart from NWAY
CTP_NWAY_dist_bayesfactor float32 None Logarithm of ratio between prior and posterior, from separation, pos
CTP_NWAY_dist_post float32 None Distance posterior probability comparing this association vs. no ass
CTP_NWAY_p_single float32 None Same as dist_post, but weighted by the prior (see Appx. in Salvato e
CTP_NWAY_p_any float32 None For each entry in the X-ray catalogue, the probability that there is
CTP_NWAY_p_i float32 None Relative probability of the eROSITA/LS8 match (see Appx. in Salvato
Dist_NWAY_LS8_ERO float32 arcsec Separation between the Xray position and the best LS8 counterparts f
GaiaEDR3_ID int64 None ID in Gaia EDR3 source catalog
GaiaEDR3_parallax float32 mas Parallax from Gaia EDR3
GaiaEDR3_parallax_error float32 mas Parallax error from Gaia EDR3
GaiaEDR3_parallax_over_error float32 None Parallax/Parallax error. ratio >5 SECURE GALACTIC
GaiaEDR3_pmra float32 mas/yr Proper motion in RA from Gaia EDR3
GaiaEDR3_pmra_error float32 mas/yr Error on Proper motion in RA from Gaia EDR3
GaiaEDR3_pmdec float32 mas/yr Proper motion in Dec from Gaia EDR3
GaiaEDR3_pmdec_error float32 mas/yr Error on Proper motion in Dec from Gaia EDR3
GaiaEDR3_phot_g_mean_mag float32 mag g band magnitude (VEGA) from Gaia EDR3
GaiaEDR3_phot_g_mean_mag_error float32 mag Error g band magnitude from Gaia EDR3
GaiaEDR3_phot_bp_mean_mag float32 mag bp band magnitude (VEGA) from Gaia EDR3
GaiaEDR3_phot_bp_mean_mag_error float32 mag Error bp band magnitude from Gaia EDR3
GaiaEDR3_phot_rp_mean_mag float32 mag rp band magnitude (VEGA) from Gaia EDR3
GaiaEDR3_phot_rp_mean_mag_error float32 mag Error bp band magnitude from Gaia EDR3
FUV float32 mag Galex Far UV magnitude (AB)
FUV_ERR float32 mag Galex Far UV magnitude error
NUV float32 mag Galex Near UV magnitude (AB)
NUV_ERR float32 mag Galex Near UV magnitude error
KiDS_u float32 mag KiDS u-band magnitude (AB)
KiDS_u_ERR float32 mag KiDS u-band magnitude error
KiDS_g float32 mag KiDS g-band magnitude (AB)
KiDS_g_ERR float32 mag KiDS g-band magnitude error
KiDS_r float32 mag KiDS r-band magnitude (AB)
KiDS_r_ERR float32 mag KiDS r-band magnitude error
KiDS_i float32 mag KiDS i-band magnitude (AB)
KiDS_i_ERR float32 mag KiDS i-band magnitude error
omegac_z float32 mag OmegaCAM z-band magnitude (AB) (Expression: toDouble($152))
omegac_z_ERR float32 mag OmegaCAM z-band magnitude error (Expression: toDouble($153))
HSC_g float32 mag HSC g-band cmodel magnitude (AB)
HSC_g_ERR float32 mag HSC g-band cmodel magnitude error
HSC_r float32 mag HSC r-band cmodel magnitude (AB) when images are mostly from r-filte
HSC_r_ERR float32 mag HSC r-band cmodel magnitude error
HSC_r2 float32 mag HSC r2-band cmodel magnitude (AB) when images are mostly from r2-fil
HSC_r2_ERR float32 mag HSC r2-band cmodel magnitude error
HSC_i float32 mag HSC i-band cmodel magnitude (AB) when images are mostly from i-filte
HSC_i_ERR float32 mag HSC i-band cmodel magnitude error
HSC_i2 float32 mag HSC i2-band cmodel magnitude (AB) when images are mostly from i2-fil
HSC_i2_ERR float32 mag HSC i2-band cmodel magnitude error
HSC_z float32 mag HSC z-band cmodel magnitude (AB)
HSC_z_ERR float32 mag HSC z-band cmodel magnitude error
HSC_Y float32 mag HSC Y-band cmodel magnitude (AB)
HSC_Y_ERR float32 mag HSC Y-band cmodel magnitude error
VISTA_z float32 mag VISTA/VIKING z-band magnitude (AB)
VISTA_z_ERR float32 mag VISTA/VIKING z-band magnitude error
VISTA_Y float32 mag VISTA/VIKING Y-band magnitude (AB)
VISTA_Y_ERR float32 mag VISTA/VIKING Y-band magnitude error
VISTA_J float32 mag VISTA/VIKING J-band magnitude (AB)
VISTA_J_ERR float32 mag VISTA/VIKING J-band magnitude error
VISTA_H float32 mag VISTA/VIKING H-band magnitude (AB)
VISTA_H_ERR float32 mag VISTA/VIKING H-band magnitude error
VISTA_Ks float32 mag VISTA/VIKING Ks-band magnitude (AB)
VISTA_Ks_ERR float32 mag VISTA/VIKING Ks-band magnitude error
W1 float32 mag LS8/Wise W1 magnitude (AB)
W1_ERR float32 mag LS8/Wise W1 magnitude error
W2 float32 mag LS8/Wise W2 magnitude (AB)
W2_ERR float32 mag LS8/Wise W2 magnitude error
W3 float32 mag LS8/Wise W3 magnitude (AB)
W3_ERR float32 mag LS8/Wise W3 magnitude error
W4 float32 mag LS8/Wise W4 magnitude (AB)
W4_ERR float32 mag LS8/Wise W4 magnitude error
LS8_g float32 mag LS8 g-band magnitude (AB)
LS8_g_ERR float32 mag LS8 g-band magnitude error
LS8_r float32 mag LS8 r-band magnitude (AB)
LS8_r_ERR float32 mag LS8 r-band magnitude error
LS8_z float32 mag LS8 z-band magnitude (AB)
LS8_z_ERR float32 mag LS8 z-band magnitude error
VHS_Y float32 mag VISTA/VHS Y-band magnitude (AB)
VHS_Y_ERR float32 mag VISTA/VHS Y-band magnitude error
VHS_H float32 mag VISTA/VHS H-band magnitude (AB)
VHS_H_ERR float32 mag VISTA/VHS H-band magnitude error
VHS_Ks float32 mag VISTA/VHS Ks-band magnitude (AB)
VHS_Ks_ERR float32 mag VISTA/VHS Ks-band magnitude error
HSC_g_diff float32 mag Difference between psf and Kron magnitude in HSC g-band (AB)
HSC_r_diff float32 mag Difference between psf and Kron magnitude in HSC r-band (AB)
HSC_i_diff float32 mag Difference between psf and Kron magnitude in HSC i-band (AB)
HSC_z_diff float32 mag Difference between psf and Kron magnitude in HSC z-band (AB)
HSC_opt_extended int32 None Extension in HSC griz bands. 1=extended; -99=data missing 0=other fr
CTP_LS8_phot_flag bool None Flag for LS8 photometry: true when the source has simultaneously g,r
CTP_LS8_TYPE char[4] None Morphological model from LS8
in_KiDS_flag int16 None Flag for KiDS coverage: 1: Source is in KiDS area; 0: otherwise
in_HSC_flag int16 None Flag for HSC coverage: 1: Source is in HSC area as from Aihara et al
CTP_Classification char[20] None SECURE/LIKELY GALACTIC/EXTRAGALACTIC, as from flowchart (see Salvato
PHZ_LePHARE_zphot float32 None Photoz from Le PHARE, but set to 0 for GALACTIC sources
PHZ_LePHARE_zl68 float32 None Le PHARE zphot max at 1 sigma
PHZ_LePHARE_zu68 float32 None Le PHARE zphot min at 2 sigma
PHZ_LePHARE_zl90 float32 None Le PHARE zphot max at 2 sigma
PHZ_LePHARE_zu90 float32 None Le PHARE zphot min at 3 sigma
PHZ_LePHARE_zl99 float32 None Le PHARE zphot max at 3 sigma
PHZ_LePHARE_zu99 float32 None Expression: null_zu99_2?zu99_1:zu99_2
PHZ_LePHARE_chi2 float32 None Le PHARE chi2 value for best fitting galaxy/AGN template
PHZ_LePHARE_modelAGN int16 None Le PHARE model number for best template fitting the data (for PLIKE
PHZ_LePHARE_extlaw int16 None Le PHARE Extinction Law applied to the template: Prevot (1) or none
PHZ_LePHARE_EBV float32 None Le PHARE E(B-V) applied to the template
PHZ_LePHARE_pdz float32 None Le Phare probability distribution. Photoz more reliable when value i
PHZ_LePHARE_nband int16 None Le Phare number of bands used for the computation of photoz
PHZ_LePHARE_zphot_2 float32 None Le Phare second best photoz from LePhare, if existing
PHZ_LePHARE_chi2_2 float32 None Le Phare chi2 value for second best fitting template, if existing
PHZ_LePHARE_modelAGN_2 int16 None Le Phare second best template fitting the data, if existing
PHZ_LePHARE_pdz_2 float32 None Le Phare probability distribution for secondary solution, if existin
PHZ_DNNZ_zphot float32 None Photoz from DNNZ (from Nishizawa et al.,), but set to 0 for GALACTIC
PHZ_DNNz_zl68 float32 None DNNz zphot min at 1 sigma
PHZ_DNNz_zu68 float32 None DNNz zphot max at 1 sigma
PHZ_DNNz_zl95 float32 None DNNz zphot min at 2 sigma
PHZ_DNNz_zu95 float32 None DNNz zphot max at 2 sigma
CTP_REDSHIFT float32 None Final redshift: zspec when available, else photo-z from Le PHARE; 0
CTP_REDSHIFT_GRADE int16 None In a range from 5 (spectroscopy) to 0 (unreliable photo-z)
CTP_CLASS int16 None Same as CTP_classification, but with numbers: 3: SECURE EXTRAGALACTI
CLUSTER_CLASS int16 None Range from 5 (most likely a cluster) to 1 (not a cluster) (see Salva
PLUG_RA float64 deg SDSS plug position coordinate: right ascension
PLUG_DEC float64 deg SDSS plug position coordinate: declination
PLATE int32 None SDSS plate used in the observation
MJD int32 day SDSS modified Julian date of observation
FIBERID int32 None SDSS fiber identification
FIELD int32 None SDSS field sequence number
CATALOGID int64 None SDSS catalog ID
RUN2D char[7] None SDSS tagged version of idlspec2d that was used to reduce the SDSS BO
DR char[4] None SDSS data release
Sep_LS8_SDSS float64 arcsec Distance between matched objects along a great circle
NSPEC int32 None SDSS number of spectra
SAMPLE char[4] None eROSITA sample
SN_MEDIAN_ALL float64 None SDSS median Signal to Noise over the entire spectral range
Z float64 None SDSS best redshift fit
Z_ERR float64 None SDSS redshift error
ZWARNING float64 None SDSS redshift measurement warning flag
ID_SRC int32 None From Liu et al. 22, ID of the sources in the eFEDS main X-ray catalo
Redshift float32 None From Liu et al. 22, The redshift adopted for the spectral model
New_Class int32 None From Liu et al. 22, Updatd classification of the optical counterpart
New_quality int32 None From Liu et al. 22, Updated counterpart quality
RA_CORR float64 deg From Liu et al. 22, Right ascension (J2000), astrometric corrected (
DEC_CORR float64 deg From Liu et al. 22, Declination (J2000), astrometric corrected (Pape
DET_LIKE float32 None From Liu et al. 22, 0.2-2.3 keV source detection likelihood (Paper I
inArea90 bool None From Liu et al. 22, Whether located inside the inner 90%-area region
EDR_QUALITY int16 None From Liu et al. 22, Counterpart quality (Paper II). A value >=2 is r
EDR_CLASS int16 None From Liu et al. 22, Classification of the optical counterpart (Paper
EDR_REDSHIFT float32 None From Liu et al. 22, Redshift of the optical counterpart (Paper II)
LxModel int32 None From Liu et al. 22, Index of selected model for luminosity measureme
NHclass int32 None From Liu et al. 22, Class of AGN NH measurement with model 1 (single
FSModel int32 None From Liu et al. 22, Index of selected model for 0.5-2keV flux. 5: co
FHModel int32 None From Liu et al. 22, Index of selected model for 2.3-5keV flux. 5: co
galNH float64 cm^-2 From Liu et al. 22, Total column density of Galactic absorption
galNHI float64 cm^-2 From Liu et al. 22, HI column density from HI4PI
SrcCts float64 counts From Liu et al. 22, Source net counts in the 0.2-5 keV band
FluxCorr_Med_s float32 erg/cm^2/s From Liu et al. 22, Absorption corrected flux in observed 0.5-2 keV,
FluxCorr_Lo1_s float32 erg/cm^2/s From Liu et al. 22, Absorption corrected flux in observed 0.5-2 keV,
FluxCorr_Up1_s float32 erg/cm^2/s From Liu et al. 22, Absorption corrected flux in observed 0.5-2 keV,
FluxCorr_Med_t float32 erg/cm^2/s From Liu et al. 22, Absorption corrected flux in observed 2.3-5 keV,
FluxCorr_Lo1_t float32 erg/cm^2/s From Liu et al. 22, Absorption corrected flux in observed 2.3-5 keV,
FluxCorr_Up1_t float32 erg/cm^2/s From Liu et al. 22, Absorption corrected flux in observed 2.3-5 keV,
FluxIntr_Med_s float32 erg/cm^2/s From Liu et al. 22, Absorption corrected flux in rest-frame 0.5-2 ke
FluxIntr_Lo1_s float32 erg/cm^2/s From Liu et al. 22, Absorption corrected flux in rest-frame 0.5-2keV
FluxIntr_Up1_s float32 erg/cm^2/s From Liu et al. 22, Absorption corrected flux in rest-frame 0.5-2keV
FluxIntr_Med_2keV float32 erg/cm^2/s/eV From Liu et al. 22, Absorption corrected flux at rest-frame 2keV, me
FluxIntr_Lo1_2keV float32 erg/cm^2/s/eV From Liu et al. 22, Absorption corrected flux at rest-frame 2keV, 1s
FluxIntr_Up1_2keV float32 erg/cm^2/s/eV From Liu et al. 22, Absorption corrected flux at rest-frame 2keV, 1s
LumiIntr_Med_s float32 erg/s From Liu et al. 22, Intrinsic luminosity in rest-frame 0.5-2 keV, po
LumiIntr_Lo1_s float32 erg/s From Liu et al. 22, Intrinsic luminosity in rest-frame 0.5-2 keV, 1s
LumiIntr_Up1_s float32 erg/s From Liu et al. 22, Intrinsic luminosity in rest-frame 0.5-2 keV, 1s
LumiIntr_Med_2keV float32 erg/s/eV From Liu et al. 22, Intrinsic luminosity at rest-frame 2keV, posteri
LumiIntr_Lo1_2keV float32 erg/s/eV From Liu et al. 22, Intrinsic luminosity at rest-frame 2keV, 1sigma
LumiIntr_Up1_2keV float32 erg/s/eV From Liu et al. 22, Intrinsic luminosity at rest-frame 2keV, 1sigma
FluxObsv_Med_s float32 erg/cm^2/s From Liu et al. 22, Observed flux in observed 0.5-2 keV, posterior m
FluxObsv_Lo1_s float32 erg/cm^2/s From Liu et al. 22, Observed flux in observed 0.5-2 keV, 1sigma lowe
FluxObsv_Up1_s float32 erg/cm^2/s From Liu et al. 22, Observed flux in observed 0.5-2 keV, 1sigma uppe
FluxObsv_Med_t float32 erg/cm^2/s From Liu et al. 22, Observed flux in observed 2.3-5 keV, posterior m
FluxObsv_Lo1_t float32 erg/cm^2/s From Liu et al. 22, Observed flux in observed 2.3-5 keV, 1sigma lowe
FluxObsv_Up1_t float32 erg/cm^2/s From Liu et al. 22, Observed flux in observed 2.3-5 keV, 1sigma uppe
lognH_KL_m1 float32 nats From Liu et al. 22, log AGN column density, KL divergence
lognH_HLo_m1 float32 cm^-2 From Liu et al. 22, log AGN column density, HDI lower limit
lognH_HUp_m1 float32 cm^-2 From Liu et al. 22, log AGN column density, HDI upper limit
lognH_Med_m1 float32 cm^-2 From Liu et al. 22, log AGN column density, posterior median
Gamma_KL_m3 float32 nats From Liu et al. 22, primary power-law slope in model 3, KL divergenc
Gamma_HLo_m3 float32 None From Liu et al. 22, primary power-law slope in model 3, HDI lower li
Gamma_HUp_m3 float32 None From Liu et al. 22, primary power-law slope in model 3, HDI upper li
Gamma_Med_m3 float32 None From Liu et al. 22, primary power-law slope in model 3, posterior me
logZ_m0 float32 None From Liu et al. 22, log Bayesian evidence with model 0: APEC
logZ_m1 float32 None From Liu et al. 22, log Bayesian evidence with model 1: single power
logZ_m2 float32 None From Liu et al. 22, log Bayesian evidence with model 2: double power
logZ_m3 float32 None From Liu et al. 22, log Bayesian evidence with model 3: powerlaw + b
logZ_m4 float32 None From Liu et al. 22, log Bayesian evidence with model 4: powerlaw wit
logZ_m5 float32 None From Liu et al. 22, log Bayesian evidence with model 5: shape-fixed

References

Aydar et al. 2025. The eROSITA Final Equatorial Depth Survey (eFEDS): SDSS spectroscopic observations of X-ray sources

Brunner et al. 2022. The eROSITA Final Equatorial Depth Survey (eFEDS). X-ray catalogue

Salvato et al. 2022. The eROSITA Final Equatorial-Depth Survey (eFEDS). Identification and characterization of the counterpar>

Liu et al. 2022. The eROSITA Final Equatorial-Depth Survey (eFEDS). The AGN catalog and its X-ray spectral properties

Almeida et al. 2023. The Eighteenth Data Release of the Sloan Digital Sky Surveys: Targeting and First Spectra from SDSS-V<>

Acknowledgement

The eROSITA data model structure for catalogues was branched from the SDSS data model for value added catalogues.