The "Grid" view is absolutely fine for me. The "Table" view is unworkable.
I have a lot of trouble scanning across lines like this, where I will lose which line I am on (when my glance shifts). This, I have realised, is due to the tendency to shift eye dominance slightly across to the right. (My eyes are subtly misaligned so I have some prism correction; a recent change to my prism correction has improved this situation for me.)
This particular presentation has the indicator line in the low/high column placed so that it makes this accidental row shifting (which is always upwards) even worse.
For me, the line graph would be better off either as the background to the cell, or towards the bottom of the cell. And the rows would need zebra-striping, subtly.
The lesson from me, a fast and able reader who is not vision- or cognitively-impaired is: don't assume that you can put stuff across wide lines in tables like this. Provide affordances so people can hold onto the "row" as they scan across. The keyline separators are not enough, and the hover-over background change is not usable on a touch device.
As it is, when I encounter stuff like this, I often have to un-maximise the window and reduce the window height so I can scroll and use the bottom of the window or the title bar of another one to provide a consistent "edge" to see the data on. If I am using my iPad, I have been known to use a piece of paper or card.