text: C--
  C--   /PHYCON/: Physical constants (initial. in INPHYS)
  C--    P0   = reference pressure
  C--    GG   = gravity accel.
  C--    RD   = gas constant for dry air
  C--    CP   = specific heat at constant pressure
  C--    ALHC = latent heat of condensation
  C--    ALHS = latent heat of sublimation
  C--    SBC  = Stefan-Boltzmann constant
  
        COMMON /PHYCON/ P0, GG, RD, CP, ALHC, ALHS, SBC
  C--
  C--   /FSIGLT/: Functions of sigma and latitude (initial. in INPHYS)
  C--    SIG    = full-level sigma 
  C--    SIGL   = logarithm of full-level sigma
  C--    SIGH   = half-level sigma
  C--    DSIG   = layer depth in sigma
  C--    POUT   = norm. pressure level [p/p0] for post-processing
  C--    GRDSIG = g/(d_sigma p0) : to convert fluxes of u,v,q into d(u,v,q)/dt
  C--    GRDSCP = g/(d_sigma p0 c_p): to convert energy fluxes into dT/dt
  C--    WVI    = weights for vertical interpolation
  C--    SLAT   = sin(lat)
  C--    CLAT   = cos(lat)
  
        COMMON /FSIGLT/ SIG(NLEV), SIGL(NLEV), SIGH(0:NLEV), DSIG(NLEV),
       *                POUT(NLEV), GRDSIG(NLEV), GRDSCP(NLEV), 
       *                WVI(NLEV,2), SLAT(NLAT), CLAT(NLAT)
  