Question: How can I figure out the correct parameters for the xfiles argument? I know that the first argument is the angstrom per pixel (which is, say, 2.1), and I know that my molecule weighs a certain amount (say, 1700 kDa). I am not sure of the third argument, but I am aware that it might be practically unused. Is it as simple as writing xfiles=2.1,1700,99? Is there something more to it? Thankyou.