SET T_MODEL

        [ASTRO\]SET T_MODEL Planet Model

    Define how the brightness temperature is computed for the selected plan-
    et(s). Planet can be JUPITER, SATURN, URANUS, NEPTUNE or ALL.  Model can
    be:
    - SPIDX: computed from the reference value and spectral index
    - MODEL: interpolated from tabulated model values
    - DEFAULT: restore the default model for the selected planet(s)