>>I tried to follow this method and it works for files that have been generated 
>>by my Veeco Dimension 3100. However, I want to do this on my own data that I 
>>obtained using the raw import function. The overlay panel only allows 
>>overlaying additional channels in the same file. Is there a way to add a 
>>channel to existing data that have been imported using "raw import"?
 >>I found one way to do this. I open the two raw data files first. With the 
 >>first image selected I go to Data Process -> Multidata ->Arithmetic . I then 
 >>set the arithmetic expression as d2 and select the second image in d2. 

 Hi,
 You can also use File / Merge to add the second raw data as a new channel of 
the first raw data.
 Regards.
 François
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