                                                                     
                                                                     
                                                                     
                                             
Title: Spitzer Observations of NGC 1333: A Study of Structure and Evolution 
       in a Nearby Embedded Cluster 
Authors: Gutermuth R.A., Myers P.C., Megeath S.T., Allen L.E., Pipher J.L., 
         Muzerolle J., Porras A., Winston E., Fazio G. 
Table: Spitzer-identified YSOs: Addendum
================================================================================
Byte-by-byte Description of file: datafile3.txt
--------------------------------------------------------------------------------
   Bytes Format Units  Label  Explanations
--------------------------------------------------------------------------------
   1-  3 I3     ---    Index  Running identification number
   5-  6 I2     h      RAh    Hour of Right Ascension (J2000) 
   8-  9 I2     min    RAm    Minute of Right Ascension (J2000) 
  11- 15 F5.2   s      RAs    Second of Right Ascension (J2000) 
                              - continuation of description
      17 A1     ---    DE-    Sign of the Declination (J2000)
  18- 19 I2     deg    DEd    Degree of Declination (J2000) 
  21- 22 I2     arcmin DEm    Arcminute of Declination (J2000) 
  24- 27 F4.1   arcsec DEs    Arcsecond of Declination (J2000) 
  29- 68 A40    ---    Match  Literature match 
  70- 75 A6     ---    Class  Source classification (1)
  77-80  F4.2   mag    AK     ? The K band extinction (2) 
  82-86  F5.2   ---    Fit    ? Fit of IRAC photometry (3)
--------------------------------------------------------------------------------
Note (1): Asterisks mark "deeply embedded" sources with questionable IRAC 
          colors or incomplete IRAC photometry and relatively bright 
          MIPS 24 micron photometry. 
Note (2): Only provided for sources with valid JHK_S_ photometry. 
Note (3): Defined as the slope of the linear least squares fit to the 
          3.6 - 8.0 micron SEDs in log{lambda} F_{lambda} vs log{lambda} space.
          Extinction is not accounted for in these values.  High extinction can
          bias Fit to higher values. 
--------------------------------------------------------------------------------
