This image shows performance of Tongaat Hulett over a period of 1 week, 2 weeks, right up to 10 years.
So the 1 week line shows the closing price 1 week ago, together with its move, total volume for the week and its high and low for the week.
The 5 year line shows the closing price 5 years ago, the move between then and now, the total volume traded in the 5 years and the highest and lowest price during that 5 year period.