Merry Christmas @thho,
thank you for the reply. I have also reached this chart. Because of my chart is not detailed as yours, I thought that there is a problem. I am confused about the meanings of every line and every column in csv file. Can you explain, please? And, in your sample data, you have more lines and columns. What is the reason?
I do not remember selecting a reference point. In which step, it is selected? Could you suggest any reference for more reading?
Best wishes.