netcdf ref_tst_unlim2 {
dimensions:
	Dr = UNLIMITED ; // (2 currently)
	D1 = 1 ;
	D2 = 2 ;
	D3 = 3 ;
	U = UNLIMITED ; // (4 currently)
variables:
	char cuu(Dr, D2, U) ;
data:

 cuu =
  "adef",
  "",
  "xy",
  "" ;
}