Hello Gwyddion users, I have a question concerning the RMS(sigma) values one can calculate with Gwyddion.
It is possible to calculate the RMS(sigma) with the "Statistical Quantities" tool. If I calculate the RMS(sigma) for the complete scan area, I get for example a value of around 150pm. However, if I take the HHCF for the same scan (again using the complete scan area) and fit the the curve with the "Exponential (HHCF)" function, I get a value of around 112pm. In the manual (http://gwyddion.net/documentation/user-guide-en/statistical-analysis.html) it is written in the "Autocorrelation Function / Height-Height Correlation Function" part that "σ denotes the root mean square deviation of the heights" so I would expect the same value in both cases. I am probably overlooking something. What is the reason for the difference? Thanks for any help, Frederik ------------------------------------------------------------------------------ _______________________________________________ Gwyddion-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/gwyddion-users
