@TIMAI2 - Thank you very much for your time, I will try directly with Google Line chart if I have problems, I will post some questions in the community.
@ABG - Please believe me that I read tons of documentation
that post - How do you use the chart2D plugin to create a chart with time as the horizontal axis - #3 by Kevinkun - I don't find it. Can be a good starting point. Thank you kindly @ABG for your guidance. My big problem is the fact that I'm not an engineering person trained (like you all), I'm a reverse-engineering trained person. I don't have your culture in the amount/diversity of things that I'll have at my disposition, I have 35+ years of research training on how other people think to make something.
Can be a weird/inappropriate approach to do something but must work. Until now it has worked without any help, from now I think that the power of distributed intelligence of people who spend their time to help can be a plus factor.
Another big thank you kindly for taking your time to illuminate me.
Best regards, Dan