I believe your Excel file will place a tab between your two columns. CAESAR II is looking for a space.
I haven't checked this but I would suggest concatenating those two columns with a space between them(i.e., =CONCATENATE(column1," ", column2). Then copy and paste the result into a .txt file and give that .txt file to CAESAR II.
The format of the file: any two numbers on a line separated by at least one space; any line starting with an asterisk will be ignored (as a comment).
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Dave Diehl