Hi,

I was using an imaging program by Pacific Nanotechnology called NanoRule which 
has it's own leveling capabilities. I was wondering if Gwyddion can perform the 
same functions as it does. Can it perform 3rd order polynomial leveling and 
line by line horizontal (or vertical) leveling? I couldn't find it in the 
Windows version GUI, so are there equivalent functions already in Gwyddion that 
can produce similar results? I found that plane leveling and arc revolving 
producing similar images. This is an image of the leveling capabilities in 
NanoRule:

http://i47.tinypic.com/n1xus6.png

Also, after leveling it in NanoRule, exporting the leveled data (in .pni 
format), and opening that data in Gwyddion, heights are not as they are shown 
in NanoRule (maximum ~2.1nm, minimum data value is zeroed, gets changed to 
3.9um, no longer zeroed). Could there a  reason why the data becomes modified 
in this manner?

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