fldname - name of field
rootname - user-supplied name for processing run
initial_exposure - exposure time in seconds prior to filtering flares.
net_exposure - exposure time in seconds after filtering flares.
idnum - source number (within field)
idradec - id created using ra/dec
telesc - telescope name
instr - detector name (ccd number in the case of invididual ccds for Chandra 
        ACIS)
x, y - position of source in image coordinates
ra,dec - J2000.0 position
cnts, cnts_err - net source counts and error
rate, rate_err - net count rate and error
SNR - signal-to-noise ratio, computed using (source counts)/sqrt(bgd counts)
poisprob - Poisson probability of source, should be similar to integral
           of a normal curve from -SNR to SNR for sources with a large number 
	   of counts.
sigmaj, sigmaj_errlow, sigmaj_errhi - major axis of elliptical Gaussian fit
                                      to stamp image and errors, in arcsec.
sigmin, sigmin_errlow, sigmin_errhi - minor axis of elliptical Gaussian fit
                                      to stamp image and errors, in arcsec.
incang, incang_errlow, incang_errhi - position angle and errors, in degrees
offax - off-axis angle estimate in arcmin.
ext - source extent flag: F = pt. src, T = extended src., A = asymetric (may
      be extended or psf may be asymetric at that off-axis angle), U = unknown
var - variability flag: T = source is variable, F = source is not variable, 
      U = unknown
N_H_gal - Galactic column density in cm^-2
default_phindex - power-law photon index used in computing flux from count rate
flux_elo, flux_ehi - energy range for flux
flux - flux estimated from count rate using a power-law model
vign - estimate of vignetting (not computed at the moment for Chandra)
spectral_fit_model - model used in spectral fitting
spectral_fit_nh, _nh_errlow, _nh_errhi - N_H and errors from spectral fit
spectral_fit_phindex, _phindex_errlow, _phindex_errhi - photon index and 
                                                        errors 
spectral_fit_chisq, spectral_fit_dof - chi^2 and deg. of freedom from fit
spectral_fit_flux - flux estimated from spectral fit
flags - flags indicating source of source parameters and if source is suspect:
        d (by itself): all parameters based on detection output
        s: counts, rate, and all spatial parameters derived from spatial fit
	x: counts and rate determined from extracted source counts
           flux determined using count rate and response specific to source
	f: spectral fit performed
	b: spatial fit was not successful (fitted source position deviated too
           much from detection position)
	p: spatial fit model count rate is inconsistent with observed count
           rate, most likely indicating that the fit failed to converge
	c: source is confused (i.e., spatial extent overlaps spatial extent
	   of another source)
htmlfile - name of htmlfile giving report for this source
version - version of XAssist used in processing
bgd_counts - Current estimate of number of background counts within source
	     region
aperture_counts, aperture_counts_err - (Net) number of counts for source 
				       derived from aperture photometry and
				       error
aperture_bgd_counts - background counts in source region derived from 
		      aperture photometry
simplespatial_counts - counts in source region derived from simple (i.e.,
		       not including PSF) spatial fit	       
simplespatial_bgd_counts - background counts in source region derived from 
			   simple spatial fit
soft_counts - (Net) soft-band counts in source region from aperture photometry
hard_counts - (Net) hard-band counts in source region from aperture photometry
soft_bgd_counts - Soft-band background counts in source region
hard_bgd_counts - Hard-band background counts in source region
hr,hr_err - (hard-counts - soft_counts)/(hard_counts + soft_counts) and error
sscale - Source region size scale (from bscale keyword in spectrum header)
bscale - Background region size scale (from bscale keyword in spectrum header)
aperture_rate, aperture_rate_err - Count rate and error based on aperture
				   photometry
detx,dety - Position of source in detector coordinates (tdetx,y for ACIS)