The Collaborative International Dictionary of English v.0.48:

chromatogram \chro*mat"o*gram\ n.
   1. the paper strip, column, gel, or TLC plate on which
      subsances have been separated by a process of
      chromatography[2].
      [PJC]

   2. the record of the results of a process of
      chromatography[2], produced by an instrument which
      measures some property related to the concentration of
      substances over the course of a chromatographic process.
      The record may be printed, for example, on a piece of
      paper, showing the concentration of some substance as a
      function of time or volume; or it may be retained in a
      computer and displayed on a video display terminal.

   Note: The analytical methods for determining which substances
         have moved to which point on the chromatogram are very
         varied, and the records of the results of a
         visualization techique, such as autoradiography, may
         itself be referred to as a chromatogram.
         [PJC]

WordNet (r) 3.0 (2006):

chromatogram
    n 1: the recording (column or paper strip) on which the
         constituents of a mixture are adsorbed in chromatography