Dear Miguel,
That is what confuses me…I did exactly the same thing as you described, I did not change the x coordinate and just leave it as it is…but I still cannot get any value…
In fact, both I and my colleague have this problem. Do you think it is a problem due to different version? I notice that you are using a older version. And my system is Ubuntu 18.04. Let me try my Mac and your version…
kind regards,
Wenqiang