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In Iris Beta 2.3, the following models are provided for fitting to SED data:

  AbsorptionEdge	Edge (in Angstroms) beyond which absorption
			is a significant feature.
	
  AbsorptionGaussian	Gaussian model of absorption feature

  AbsorptionLorentz	Lorentz model of absorption feature

  AbsorptionVoigt	Voigt model of absorption feature

  AccretionDisk		Accretion disk continuum function

  BlackBody		Blackbody continuum function

  Bremsstrahlung	Bremsstrahlung continuum function

  BrokenPowerlaw	Broken power-law (index changes at break)

  CCM			Cardelli, Clayton, and Mathis extinction curve
			((ApJ, 1989, vol 345, pp 245)

  EmissionGaussian	Gaussian model of emission feature

  EmissionLorentz	Lorentz model of emission feature

  EmissionVoigt		Voigt model of emission feature

  LogAbsorption		Log of absorption Gaussian function expressed 
			in optical depth

  LogEmission		Log of the emission Gaussian function

  OpticalGaussian	Absorption Gaussian function expressed in
			optical depth

  Polynomial		Fifth-degree polynomial continuum function

  Powerlaw		Power-law continuum function

  Recombination		Optically thin recombination model

  XGal			Extragalactic extinction function of Calzetti, 
			Kinney and Storchi-Bergmann (1994, ApJ, 429,
			582)  

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