!-----------------------------------------------------------------------
&nam_zgr       !   vertical coordinate
!-----------------------------------------------------------------------
   ln_zco   =  .false.     !   z-coordinate - full    steps  
   !                       !       ("key_zco" may also be defined)
   ln_zps   =  .true.      !  z-coordinate - partial steps   
   ln_sco   =  .false.     !  s- or hybrid z-s-coordinate   
/