netcdf filteredvv {
dimensions:
	dim0 = 4 ;
	dim1 = 4 ;
variables:
	float var1(dim0, dim1) ;
		var1:_Storage = "chunked" ;
		var1:_ChunkSizes = 2, 2 ;
		var1:_Filter = "307,9" ;
		var1:_NoFill = "true" ;

// global attributes:
		:_Format = "netCDF-4" ;
data:

 var1 =
  100, 101, 102, 103,
  104, 105, 106, 107,
  108, 109, 1010, 1011,
  1012, 1013, 1014, 1015 ;

group: g {
  variables:
  	float var2(dim0, dim1) ;
  		var2:_Storage = "chunked" ;
  		var2:_ChunkSizes = 2, 2 ;
  		var2:_Filter = "307,9" ;
  		var2:_NoFill = "true" ;

  // group attributes:
  data:

   var2 =
  0, 1, 2, 3,
  4, 5, 6, 7,
  8, 9, 10, 11,
  12, 13, 14, 15 ;
  } // group g
}