The catalogs contain the following columns:

# COL 1,  NUMBER: ID from the Skelton et al. (2014) photometric catalogs from the 3D-HST team
# COL 2,  RA: from SExtractor, measured in F160W
# COL 3,  DEC: idem.
# COL 4,  f: FLAG value (0: good fit; 1: suspicious fit; 2: bad fit; 3: no fit -- see van der Wel et al. 2012)
# COL 5,  mag: total AB magnitude from best-fitting Sersic model (GALFIT)
# COL 6,  dmag: 1-sigma uncertainty in mag
# COL 7,  re: semi-major axis in arcsec of the ellipse that contains half of the total light in the best fitting Sersic model
# COL 8,  1-sigma uncertainty on re
# COL 9,  n: Sersic index of the best-fitting Sersic model
# COL 10, dn: 1-sigma uncertainty on n
# COL 11, q: axis ratio of the best fitting Sersic model
# COL 12, dq: 1-sigma uncertainty on q
# COL 13, pa: position angle in degrees (0: North; 90: East)
# COL 14, dpa: 1-sigma uncertainty on pa
# COL 15, sn: S/N as measured in the F???W filter, integrated over the F160W segmentation region

Note that the uncertainties presented here are not computed by galfit, but
derived as described by van der Wel et al. (2012).