!
! Molecular weights:
!
      real,parameter ::
     |  RMN4S=14., RMN2D =14., RMNO =30., RMAR =40., RMOH =17.,
     |  RMO1 =16., RMCH4 =16., RMCO =28., RMCO2=44., RMH2 = 2.,
     |  RMH2O=18., RMH2O2=34., RMHE = 4., RMH  = 1., RMHO2=33.,
     |  RMO3 =48., RMHOX = 1., RMNO2=46., RMNAT=23., RMOP =16.