# Data Points and Errors

If you selected to scan also the error points (see Scan Settings) the work flow looks slightly different:

If scanning x-errors
  After storing the data point using the `Space` key the horizontal part of the crosshair disappears from the screen in order to not obstruct the horizontal error bars. The original data point is marked by a green marker so you always know what point is the current one. Follow exactly the instructions in the status bar at the bottom of the main window. You need to scan the left error bar first and then the right one. Once both x-error bars are scanned the horizontal line of the crosshair is displayed again, the cross-shaped marker disappears, and the data point including the x-errors is displayed in the Data Table. If you have chosen to scan symmetric errors the left and right errors will be identical but are still listed twice. Note also that the crosshair gets positioned in its original position.
If scanning y-errors
  After storing the data point using the `Space` key the vertical part of the crosshair disappears in order to not obstruct the vertical error bars. The original data point is marked by a blue cross so you always know what point is the current one. Follow exactly the instructions in the status bar at the bottom of the main window. You need to scan the lower error bar first and then the upper one. Once both y-error bars are scanned the vertical line of the crosshair is displayed again, the cross-shaped marker disappears, and the data point including the y-errors is displayed in the Data Table. If you have chosen to scan symmetric errors the upper and lower errors will be identical but are still listed twice. Note also that the crosshair is positioned also in its original position.
If scanning x- and y-errors
  You are asked to first scan the x-error bars and then the y-error. Note that you cannot change any settings during this procedure.