c********   edit with Vi for proper alignment **********
c***
c***     two types of ice grids : grid_ICEDYN and grid_NXY
c***     grid_NXY is wrapped around for periodicity in lon direction
c***
                    usi(1,j)
             |------x------|     |------|
             |      |      |     |      |
             |  1   |  2   | ... |imicyn|            grid_ICDYN
             |      |      |     |      |
             |------|------|     |------|
                ^                   ^ 
                |                   |
                 -------------------|------
           _________________________|      |              
1=imicdyn |                                | NX1=1
          |         uice(2,j)              |
      |------|------x------|     |------|------|
      |      |      |      |     |      |      |
      |  1   |  2   |      | ... |NX1-1 | NX1  |     grid_NXY
      |      |      |      |     |      |      |
      |------|------|------|     |------|------|