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If either the Measuring VI or the Response VI do not already have a text file with data recorded saved on your computer, you will initially need to run with a development text file. This text file simply contains any number between 0 and 100 that will serve as the temporary Measuring VI text file containing the "level". With this as a replacement for the text file containing the new level data, you can run the two VIs and create a brand new logfile.txt. The next time you run the two VIs you can use logfile.txt with a new Measuring VI text file named after whatever your little heart desires. 
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CONGRATS ON MAKING IT TO THE END!!!
Please indulge in this quality image of an inspirational kitten. - E
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