How to Read RawDigger Histogram with EV

I newly have just started to use RawDigger for inspecting raw image quality. However, still I am not too familiar with all its properties/concepts, and I am specifically confused with how to read logarithmic histogram in it with the EV-stop indicator.

Here is an example of a logarithmic histogram of a raw (CR2) photo that is clearly too much underexposed (I got that from the numbers and percentage it shows in the main window)

So is it the case that, when the tail of a histogram ends at specific EV number it indicates by how many stops it is over- underexposed?

i.e. Red channel histogram stops at nearly -0.7EV –> it is underexposed by that amount and must be near EV0 to be perfectly captured just like the green channel’s histogram?

Meaning next time I shoot with those settings the same as how this photo was taken I must add that amount of EV to have good quality photo?