* File name:
  I_[survey][site][field number]_[filter].[extension]
  -- [survey]      : name of survey
  -- [site]        : for KMTNet case, "C", "S", and "A" indicates "CTIO", "SAO", and "SSO" site, respectively
  -- [field number]: KMTNet field number
  -- [filter]      : filter used for observations
  -- [extension]   : explained below

* # NOTE #
  The KMT CTIO light curve was split into THREE parts due to systematic issues caused by electronic problems during the commissioning season in 2015.

* File extension:
  -- [pys]: KMTNet reductions of the light curve observed at each KMTNet observatory for modeling 
  -- [dat]: light curve observed by OGLE survey

* File formats:
  # ==========================================================
  # For KMTNet [pys],
  # ==========================================================
  # column        value                      unit 
  # ----------------------------------------------------------
      1     HJD' = HJD -245000.0        days
      2     Magnitudes in I filter      instrumental magnitude
      3     Magnitudes error            instrumental magnitude
  # ==========================================================

  # ==========================================================
  # For OGLE [dat],
  # ==========================================================
  # column        value                      unit 
  # ----------------------------------------------------------
      1     HJD' = HJD -245000.0        days
      2     Magnitudes in I or V filter instrumental magnitude
      3     Magnitudes error            instrumental magnitude
  # ==========================================================

