netcdf test_opaque_array {
types:
  opaque(8) o_t;  
dimensions:
  d2 = 2;
variables:
  o_t vo2(d2,d2);
data:
 vo2 =
   0X0123456789ABCDEF, 0XABCDEF0000000000,
   0XFEDCBA9876543210, 0XFEDCBA9999999999;
}