PI Vision graph of PI Point (Step=ON)

Hello,

I would like to know about the display on PI Vision when PI Point step is set to ON.

(1) Are the two points plotted at the same time on the graph at the leftmost (start time)?

(2) If there is an error value at the PI Point to be plotted, are two points plotted at the same time before and after the error value?

(3) Is the specification that future values are not plotted although they are connected by a line?

Also, if there is a way to avoid two points being plotted at the same time, please let me know.

Thank you in advance.