                                
                          ----  Start of the PSF segment
                      IPP_IDET  IPP detection identifier index
                         X_PSF  PSF x coordinate
                         Y_PSF  PSF y coordinate
                     X_PSF_SIG  Sigma in PSF x coordinate
                     Y_PSF_SIG  Sigma in PSF y coordinate
                        RA_PSF  PSF RA coordinate (degrees)
                       DEC_PSF  PSF DEC coordinate (degrees)
                      POSANGLE  position angle at source (degrees)
                      PLTSCALE  plate scale at source (arcsec/pixel)
                  PSF_INST_MAG  PSF fit instrumental magnitude
              PSF_INST_MAG_SIG  Sigma of PSF instrumental magnitude
                 PSF_INST_FLUX  PSF fit instrumental flux (counts)
             PSF_INST_FLUX_SIG  Sigma of PSF instrumental flux
                        AP_MAG  magnitude in standard aperture
                    AP_MAG_RAW  magnitude in reported aperture
                 AP_MAG_RADIUS  radius used for aperture mags
                       AP_FLUX  instrumental flux in standard aperture
                   AP_FLUX_SIG  aperture flux error
              PEAK_FLUX_AS_MAG  Peak flux expressed as magnitude
                   CAL_PSF_MAG  PSF Magnitude using supplied calibration
               CAL_PSF_MAG_SIG  measured scatter of zero point calibration
                        RA_PSF  PSF RA coordinate (degrees)
                       DEC_PSF  PSF DEC coordinate (degrees)
              PEAK_FLUX_AS_MAG  Peak flux expressed as magnitude
                           SKY  Sky level
                     SKY_SIGMA  Sigma of sky level
                     PSF_CHISQ  Chisq of PSF-fit
                     CR_NSIGMA  Nsigma deviations from PSF to CF
                    EXT_NSIGMA  Nsigma deviations from PSF to EXT
                     PSF_MAJOR  PSF width (major axis)
                     PSF_MINOR  PSF width (minor axis)
                     PSF_THETA  PSF orientation angle
                        PSF_QF  PSF coverage/quality factor (bad)
                PSF_QF_PERFECT  PSF coverage/quality factor (poor)
                      PSF_NDOF  degrees of freedom
                      PSF_NPIX  number of pixels in fit
                    MOMENTS_XX  second moments (X^2)
                    MOMENTS_XY  second moments (X*Y)
                    MOMENTS_YY  second moments (Y*Y)
                   MOMENTS_M3C  third momemt cos theta
                   MOMENTS_M3S  third momemt sin theta
                   MOMENTS_M4C  fourth momemt cos theta
                   MOMENTS_M4S  fourth momemt sin theta
                    MOMENTS_R1  first radial moment
                    MOMENTS_RH  half radial moment
                     KRON_FLUX  Kron Flux (in 2.5 R1)
                 KRON_FLUX_ERR  Kron Flux Error
               KRON_FLUX_INNER  Kron Flux (in 1.0 R1)
               KRON_FLUX_OUTER  Kron Flux (in 4.0 R1)
                 SKY_LIMIT_RAD  Radius where object hits sky
                SKY_LIMIT_FLUX  Flux / pix where object hits sky
               SKY_LIMIT_SLOPE  d(Flux/pix)/dRadius where object hits sky
                     DIFF_NPOS  nPos (n pix > 3 sigma)
                   DIFF_FRATIO  fPos / (fPos + fNeg)
               DIFF_NRATIO_BAD  nPos / (nPos + nNeg)
              DIFF_NRATIO_MASK  nPos / (nPos + nMask)
               DIFF_NRATIO_ALL  nPos / (nGood + nMask + nBad)
                      DIFF_R_P  distance to positive match source
                     DIFF_SN_P  signal-to-noise of pos match src
                      DIFF_R_M  distance to negative match source
                     DIFF_SN_M  signal-to-noise of neg match src
                         FLAGS  psphot analysis flags
                        FLAGS2  psphot analysis flags
                      PADDING2  more padding
                      N_FRAMES  Number of frames overlapping source center
                       PADDING  padding
                                
                          ----  Start of the XSRC segment
                      IPP_IDET  IPP detection identifier index
                         X_EXT  EXT model x coordinate
                         Y_EXT  EXT model y coordinate
                     X_EXT_SIG  Sigma in EXT x coordinate
                     Y_EXT_SIG  Sigma in EXT y coordinate
                    F25_ARATIO  Axial Ratio of radial profile
                     F25_THETA  Angle of radial profile ellipse
                     PETRO_MAG  Petrosian Magnitude
                 PETRO_MAG_ERR  Petrosian Magnitude Error
                  PETRO_RADIUS  Petrosian Radius (pix)
              PETRO_RADIUS_ERR  Petrosian Radius Error (pix)
               PETRO_RADIUS_50  Petrosian R50 (pix)
           PETRO_RADIUS_50_ERR  Petrosian R50 Error (pix)
               PETRO_RADIUS_90  Petrosian R90 (pix)
           PETRO_RADIUS_90_ERR  Petrosian R90 Error (pix)
                    PETRO_FILL  Petrosian Fill Factor
                     PETRO_MAG  Petrosian Magnitude
                 PETRO_MAG_ERR  Petrosian Magnitude Error
                  PETRO_RADIUS  Petrosian Radius
              PETRO_RADIUS_ERR  Petrosian Radius Error
               PETRO_RADIUS_50  Petrosian R50 (pix)
           PETRO_RADIUS_50_ERR  Petrosian R50 Error (pix)
               PETRO_RADIUS_90  Petrosian R90 (pix)
           PETRO_RADIUS_90_ERR  Petrosian R90 Error (pix)
                    PETRO_FILL  Petrosian Fill Factor
                       PROF_SB  mean surface brightness annuli
                     PROF_FLUX  flux within annuli
                     PROF_FILL  fill factor of annuli
                                
                          ----  Start of the XFIT segment
                      IPP_IDET  IPP detection identifier index
                         X_EXT  EXT model x coordinate
                         Y_EXT  EXT model y coordinate
                     X_EXT_SIG  Sigma in EXT x coordinate
                     Y_EXT_SIG  Sigma in EXT y coordinate
                        RA_EXT  EXT model ra coordinate
                       DEC_EXT  EXT model dec coordinate
                  EXT_INST_MAG  EXT fit instrumental magnitude
              EXT_INST_MAG_SIG  Sigma of PSF instrumental magnitude
                      POSANGLE  position angle at source (degrees)
                      PLTSCALE  plate scale at source (arcsec/pixel)
                    MOMENTS_XX  second moment in x
                    MOMENTS_XY  second moment in x,y
                    MOMENTS_YY  second moment in y
                    MOMENTS_R1  first radial moment
                    MOMENTS_RH  half radial moment
                  PSF_INST_MAG  PSF fit instrumental magnitude
                        AP_MAG  PSF-sized aperture magnitude
                      KRON_MAG  Kron Mag
                       NPARAMS  number of model parameters
                       NPARAMS  number of model parameters
                    MODEL_TYPE  name of model
                 EXT_WIDTH_MAJ  EXT width (major axis), length for trail
                 EXT_WIDTH_MIN  EXT width (minor axis), sigma for trail
                     EXT_THETA  EXT orientation angle
             EXT_WIDTH_MAJ_ERR  EXT width error (major axis)
             EXT_WIDTH_MIN_ERR  EXT width error (minor axis)
                 EXT_THETA_ERR  EXT orientation angle (error)
                 EXT_WIDTH_MAJ  EXT width (SXX, isnan)
                 EXT_WIDTH_MIN  EXT width (SYY, isnan)
                     EXT_THETA  EXT angle (SXY, isnan)
             EXT_WIDTH_MAJ_ERR  EXT width err (SXX, isnan)
             EXT_WIDTH_MIN_ERR  EXT width err (SYY, isnan)
                 EXT_THETA_ERR  EXT angle err (SXY, isnan)
                 EXT_WIDTH_MAJ  EXT width (major axis), length for trail
                 EXT_WIDTH_MIN  EXT width (minor axis), sigma for trail
                     EXT_THETA  EXT orientation angle
             EXT_WIDTH_MAJ_ERR  EXT width error (major axis)
             EXT_WIDTH_MIN_ERR  EXT width error (minor axis)
                 EXT_THETA_ERR  EXT orientation angle (error)
                                
                                
                                
                                
                          ----  Start of the XRAD segment
                      IPP_IDET  IPP detection identifier index
                        X_APER  Center of aperture measurements
                        Y_APER  Center of aperture measurements
                      PSF_FWHM  FWHM of matched PSF
                      PSF_FWHM  image is not FWHM-matched
                     APER_FLUX  flux within annuli
                 APER_FLUX_ERR  flux error in annuli
               APER_FLUX_STDEV  flux standard deviation
                     APER_FILL  fill factor of annuli
         STACK.PSF.FWHM.VALUES  PSF sizes
