Appended text file in loop adds unwanted delimiter value at end of each iteration.

I am using 'Export To Spreadsheet.vi' in a loop which saves a text file and appends data from a 1D array waveform for each iteration. My problem is that at the end of every iteration an extra delimiter value is appended to the file. When I then attempt to graph my data, I get gaps, as seen below (circled in black).

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When I start to analyze the data, I'm sure this will be a nuisance. I can not seem to find a solution to this problem. Any advise would be greatly appreciated. 

Thanks.