Regarding the creation of Galois Field.

Please consider this:

>> data_source = randsrc(1,493, 0:1);

>> msg=gf(data_source,9); %creation of Galois field

Now,in Workspace this creates a variable as: "msg=<1x493 gf>".

and when i open it in variable-editor,it is showing "gf object: 1-by-65" as first entry in (1,1) position.

what is the origin of this "1-by-65"?