SDS is chunked
 Chunks dimensions are   2  x  3
 
   1  1  1  3  3  3  0  5  0
   1  1  1  3  3  3  0  5  0
   2  2  2  0  0  0  6  6  6
   2  2  2  4  4  4  6  6  6
 
 Chunk (2,2)
 
   0  0  0
   4  4  4
 
 Chunk (1,3)
 
   0  5  0
   0  5  0