SHOW SED [Frequency [FileName]] Display the SED, computed by the "SED" widget from images (using the FLUX command) or from UV Tables (by fitting a simple model using UV_FIT), and fit a simple power law model through it. Frequency is the reference frequency in GHz at which the flux is comput- ed. FileName is the data file produced by the "SED" widget. If Frequency or Filename are not specified, their last values are re- used.