Hey all,

I am having a very inconvinient problem, which seems to potentially ruin
several weeks of hard work -- and it would be immensly appreciated if anyone
could come up with a quicly implementable solution.

OK, the data I am trying to present is power demand for trains on a distance
of rail over time. In the data I have, power demand is measured at every 250
metres for each train. This means taht my data is like this.

m T1 T2 . . .
0 1500 5462 . . .
250 1700 1654 . . .
500 1200 6542 . . .
750 4000 1224 . . .
1000 3100 5555 . . .
..
..
..

Where at each cell (each 250 m) I know the power demand. Additionally, I
know at what time the trains passed each 250-metre point.

Therefore, with graph with a X-Y Scatter Chart, I can graph Power as a
function of time even though time is not an independent variable.

However, I have problems graphing the aggregate power demand as a function
of time.

Is there anyway I can sum alle the graphs in one chart, or anything similar?
Thanks in advance