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- Rectangular computational domain:
small part of the stellar surface,

effects of surface curvature and variation of gravity ignored,

side length: 11x5.5 Gm, 500^{2}points (varying with T_{eff}) - Constant gravity: logg=2,

temperature sequence: 5000K < T_{eff}< 6200K,

solar composition - Lower boundary: prescribed energy flux enters as radiation, closed for matter
- Side boundaries: periodic
- Top boundary: Closed for matter, transmitting for radiation.