It’s easy to correct bad data on your chart. Move the mouse over the data of interest until the mouse pointer changes to a hand. Right mouse click on the data stream of interest. Select Modify Selected Data Files, and find the date of interest. In this case were looking for May 6. Select the cell you want to change. Type in the new value and select OK. If you ever want to restore that data value, you can right click, modify selected data file, and notice that the corrected value is highlighted. Click in the cell and click restore.