excellent info thanks again Wiz , yes i'll have to get the chord details , i have my script giving me the ZFW and LIZFW , TOW and Index and LAW and index , i've just applied a script to do what the manual loadsheet does, its for an Airbus A310F ,i have the DOW and DOI etc in a database and the deadload is calculated by the script , when i decided to depict the graph is when i came to this hurdle , about the datum ..yes in this case it is 6.3825 meters forward of the nose and there is a reference point to get the +ve and -ve moments,i'll look to get the chord info now....thanks for your help..will post again to follow up this thread