Basic question for mask making for local refinement

Hi
I have found this discussion very helpful, thanks.
I have one question regarding the fulcrum selection. In the tutorial, it suggests to divide the chimera generated values (x,y,z) by the pixel size. is it correct?
If yes, then should I use the super res. pixel which in my case is 0.324. Also, when I divided the coordination values (x,y,z) by 0.324, the new values are 561.1, 591.38, and 592.728. the local refinement ended up with the error “out of memory”
Any suggestion regarding how to fix the error will be highly appreciated.

Cheers