I have a data set over a ten year period, and created a simple line graph to show the trend. however, i want to add in vertical lines at certain time points to indicate when specific events occured that explain why the trend is moving a certain way. for example, i want to add a line for september 11, to explain why employment might have dropped so drastically.
i don't know how to approach this. i tried looking through the manuals and online help, but don't really know where to start. any help would be greatly appreciated.
thanks
clara
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