Thanks Lei, that looks perfect!
We just upgraded from 8.1.3 to 9.3.3 in the past two weeks, so LOD calcs are an entirely new beast for me and I'm still trying to wrap my head them.
Will have to study your formula to help glean some understanding.
LOD is really great!
While sometimes it makes me feel I am not clever enough to make full use of it.
Here's a link for your reference, which is very helpful for me.