27- If the scan line is not horizontal, alter the value for ‘Y-slope’ until the y-axis of the scan lies parallel to the y-axis of the sample.- Reset the ‘Rotation’ to 0°. The ‘LineView’ shows the X-slope again.The value of the ‘Z-Offset’ varies slightly during measurement. This is cor-rect because the option ‘Auto. Adjust Z-Offset’ in the menu ‘Options’ shouldbe active.Achieving atomic resolutionYou prepared your measurement so that the scan line in the centre of the‘LineView’ is reproducing stably. Now the scan range has to be reduced,and the measured signals amplified in order to observe the atomic struc-ture.Reminder: Measurements on the nanometer scale are very sensitive. Directlight, fast movements causing air flow and temperature variations near thescan head can influence and disturb the measurement. It is best to let apromising measurement run for some time to let it stabilize thermally.The following settings apply to measurements on graphite:1. Reduce the value of ‘Z-Range’ in ‘ScanPanel’ to 50nm in order to con-centrate the measurement to this range.Diminishing ‘Z-Range’ amplifies the signal in Z-direction2. Limit the scan range:- click the ‘TopView’-Display to make sure that it is active: its titlebar isthe same colour as the main bar.FIRST MEASUREMENTSACHIEVING ATOMIC RESOLUTION