Perhaps using a named range referring to
Code:
=INDEX($E3:$Z3,MATCH(9.99E+307,$E3:$Z3)-3):INDEX($E3:$Z3,MATCH(9.99E+307,$E3:$Z3))
Replace the 3 with any value or, better , with a cell reference. This will give you more flexibility[/code]Then use the named range as data source for your graph
( I hope I got the brackets right

)