Originally Posted by bsieker
Connecting lines should not have been drawn, and arguably even the invalid data points should not have been plotted. They have no significance whatsoever.
In fact such lines should never be drawn, unless the expected rate-of-change is so low that linear interpolation will provide a sufficient approximation.
So,
Bernd, these lines have been automatically drawn (?) and have not been manually erased (?), or have been manually drawn (?)