#----  CATALOGS PRESENTATION ----#
The file contains stellar parameters (Teff, log g, and [Fe/H]) and four elemental abundances ([C/Fe], [N/Fe], [Mg/Fe], and [Ca/Fe]) estimated by a set of cost-sensitive neural networks (CSNet). Detail description of the columns in catalog_jplus_dr1_parameters.fits for two million stars in Yang et al. 2021 (https://ui.adsabs.harvard.edu/abs/2021arXiv211207304Y). If you have used this data in your work, please cite this paper.
 
#---- DATA FORMAT ----#
The catalog is provided as a table in FILS format. It can be easily accessed by using the "fits" python package and using the following commands:

  from astropy.io import fits
  with fits.open('path/to/filename') as hdu:
      data = hdu[1].data
Single data columns are loaded as nD-arrays into the dictionary-like structure "data" and can be accessed through their keys, simply as e.g.:

  data['RA']   --> RA column 
  data['DEC']   --> DEC column 
  data['TEFF_CSNET']      --> Effective temperature estimate column

The following enumeration describes the data column associated to each
FILS key:

  'source_id'         : int     : J-PLUS source id
  'gl'                : double  : Galactic longitude from the J-PLUS DR1 catalog (deg)
  'gb'                : double  : Galactic latitude from the J-PLUS DR1 catalog (deg)
  'ra'                : double  : Right ascension from the J-PLUS DR1 catalog (J2000; deg)
  'dec'               : double  : Declination from the J-PLUS DR1 catalog (J2000; deg)
  'MAG_APER6'         : float   : Photometry in 12 filters from the re-calibrated J-PLUS DR1 catalog
  'ERR_APER6'         : float   : Uncertainty in MAG_APER6 (mag)
  'FLAGS'             : int     : Inherited from SExtractor’s FLAGS parameter
  'PHOT_BP_MEAN_MAG'  : float   : BP-band photometric magnitude from Gaia DR2
  'PHOT_RP_MEAN_MAG'  : float   : RP-band photometric magnitude from Gaia DR2
  'PHOT_G_MEAN_MAG'   : float   : G-band photometric magnitude from Gaia DR2
  'PHOT_BP_MEAN_FLUX' : float   : BP-band photometric flux from Gaia DR2
  'PHOT_RP_MEAN_FLUX' : float   : RP-band photometric flux from Gaia DR2
  'PHOT_G_MEAN_FLUX'  : float   : G-band photometric flux from Gaia DR2
  'EBV'               : float   : Interstellar extinction from the Schlegel et al. (1998) dust-reddening map
  'TEFF'              : float   : Effective temperature (K)
  'TEFF_FLAG'         : int     : A quality flag for Teff
  'LOGG'              : float   : Surface gravity
  'LOGG_FLAG'         : int     : A quality flag for log g
  'FE_H'              : float   : Iron to hydrogen abundance ratio
  'FE_H_FLAG'         : int     : A quality flag for [Fe/H]
  'ALPHA_FE'          : float   : {\alpha}-element to iron abundance ratio  
  'ALPHA_FE_FLAG'     : int     : A quality flag for [{\alpha}/Fe]
  'C_FE'              : float   : Carbon to iron abundance ratio
  'C_FE_FLAG'         : int     : A quality flag for [C/Fe]
  'N_FE'              : float   : Nitrogen to iron abundance ratio
  'N_FE_FLAG'         : int     : A quality flag for [N/Fe]
  'MG_FE'             : float   : Magnesium to iron abundance ratio
  'MG_FE_FLAG'        : int     : A quality flag for [Mg/Fe]
  'CA_FE'             : float   : Calcium to iron abundance ratio
  'CA_FE_FLAG'        : int     : A quality flag for [Ca/Fe]