OK, you've defined the chart as having 24 patches, which is fine. Now change the Measurement Mode to "Spot" and you will take a spot reading (that's one shot) of each of his 24 patches. You must read exactly 24 patches for this to work. Measure them in the same order every time. Then in the little Page Data bit at the bottom left of the GUI, click on Save; when your computer file structure comes up, migrate to the folder where you want to keep these measurements, for file type select i1Profiler CGATS Custom.txt, click save. Remember that location. Now go to Excel, open a new spreadsheet and go to File>Import. When the file system comes up, migrate to the file you just saved out of i1Profiler and click Open or Import or whatever it says in your version of Excel. That will import into Excel the data you measured as a list in CGATS format. This is what you want to have. You'll repeat this exercise periodically and compare numbers between episodes.