The code parameter allows to select from a range of stellar models, either analytical, or availbale as data files or FITS images. Please note that a new numbering scheme was introduced with Version 6.12 (2 Aug 2007)
For all codes from zero to 11, the flux distribution is computed as flat (teff=0), a black body (teff < 0), or a stellar atmosphere (teff > 0). For all codes, specifying an arbitrary SED will override stellar spectra or fluxes derived from the images. The XDR file is given in sed, and should restore variables and , which contain the wavelength in meters and the flux (per wavelength interval), respectively.
In many models, specifying pa and ratio is used to rotate and stretch the coordinates. The only exceptions are the images if a positive non-zero diameter of the CLEAN beam have been specified.