Line chart is cut off when lineWidth is greater than 1

[Phúc Nguyễn]

Hi all, I have an issue with Google Line Chart. When I try to configure the lineWidth property of the line chart, I notice that a part of the line is cut off. This issue does not occur when lineWidth = 1. Is there any way to make the line fully displayed without changing the max and the min property of the viewWindow. 

Thanks a lot.

Here is a demo: https://jsfiddle.net/xms65j3f/16/