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  This function tags sources with IR excess based on their colors
  in Spitzer IRAC bands 1-4. The cut used comes from Megeath et al
  2004, ApJS 154:367. Sources are tagged as source 0/I, II, or
  III/main sequence


  catalog processing

Calling Sequence



  i1: IRAC band 1 magnitude(s)
  i2: IRAC band 2 magnitude(s)
  i3: IRAC band 3 magnitude(s)
  i4: IRAC band 4 magnitude(s)

Keyword Parameters

  VERBOSE: if set, then a summary of the sources is printed to the screen.


  A vector of bytes the same length as i1-i4. The value at slot i is
  1, 2, or 3 depending on whether the source at slot i has colors
  like a class I, II or III/Main Sequence star. Only sources marked
  as 1 or 2 should be considered as candidate excess stars.

Modification History

  Written by: Chris Beaumont, June 2008.
  November 2008: Changed name from SOURCETAG to YSOTAG

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