I am trying to achieve a similar graph to the one shown below. I have been researching how to add lines as separators and put 2 box plots in between 2 lines. The dataset I have is that I have 3 message sizes of type A and 3 same message sizes of type B. I want to draw them side by side based on their sizes. Below is the similar graph that I want to achieve. There are 2 box plots in each column which represent they are the same message size, only different type.

What keyword should I search for that result?
