The measurementsToCSV method The measurements TOCSV method takes a list of measurements (for example, as returned from measure) and generates a comma-separated-values String of the measurements. It should have the following format, where the first row is a literal header row and the other rows are example data. Note that this data is completely made up, and may not match your measurements. You might choose to put all of the measurements for a single letter together: name, n, nanoseconds A, 40, 1034 A,41,1039 A,42,2033 ... many rows for A ... A, 100, 432 B, 40, 1034 B,41,4038 ... many rows for B... You might also choose to put all of the measurements for a single round of n together: name, n, nanoseconds A,40,1034 B,40, 1034 A,41, 1039 B,41,4038 A,42, 2033 B, 42,4038 .. many alternating rows of A, B... A, 100,432 B, 100,6038 Either layout is fine, do what makes sense to you, or what matches your measure function best, etc.