I am in the process of putting together a binder of Airbus, Boeing, and possible Bombardier/Embraer payload/range charts for my own fuel planning needs (FSX). However, while Boeing's charts are comprehensive and easy to use, Airbus' charts do not feature the diagonal lines needed to find the takeoff weight, which are pretty important for finding the weight of my required fuel, not to mention most of the ranges begin at either 3 or 4 thousand nautical miles, making it quite difficult to plan for a trip under that length.
Here is a 777-200 chart for reference. I tried to upload an A330 chart but there were issues; however just Google "A330 Payload/Range" and look under "Images" for plenty of examples.
Click image for larger version. 

Name:	772 P-R.gif 
Views:	5948 
Size:	24.3 KB 
ID:	180446

Anyway, am I reading the Airbus charts wrong, or can somebody help me figure out how to read them?
Thanks,
FPL