So I've looked at that graph but it still doesn't make sense to me (I'm looking at the version II 1998 appendix 6) it shows at the bottom of that graph that "Cost Index = KG per minute" and that we would potentially have 8 kg per minute burn for LRC which is clearly not correct aws that would only be 480 kgs per hour. Obviously I am missing something in the interpetation of this chart but I don't know what it is.