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If you create the graph with both sets of data then right click on the one you want to be a line, change graph type of this one to a line graph and bingo done. if this doesnt help i will try an create you a quick user guide... pm me your email or something
Steve has got it, just make sure you have got 1 data series selected when you are trying to change the type (click on it in the legend, but make sure 1 series is selected not the whole legend)