XCLL, XCLCEdit
This page says that XCLL provides the (X,Y) grid for an exterior cell and lighting for an interior cell. However, in the entire Oblivion.esm file, XCLL is not a provided parameter for a single exterior cell, so it is definitely not being used to provide the X,Y grid.
Instead, the XCLC parameter is provided for all exterior cells (and no interior cells), and contains a long[2] structure that agrees in all cases with the x,y coordinates (checked by comparing with the cell x,y coordinates that are listed if you export all the cell info to a file).
So I'm changing this page accordingly. I'm leaving the statement that XCLL contains "lighting" although I have absolutely no idea of what the format of that information is. --Nephele 01:47, 16 March 2007 (EDT)