The other element contains all objects which are not defined in a specific module (object file),
There are many different things like the stack (that might be the 512 Data), the startup data structure, copy down information, vectors defined in prm's, included srecords and more. If you are running XGATE code out of RAM, the copy down information for that XGATE code might be also included in others, I'm not sure.
I usually look in the list which is sorted by address to find out where all the memory goes, not primarily in the module list.
Daniel