Basically I've been writing my work with XeLaTeX enthusiastically now for about a year and love it, but today for the first time I tried to draw a graph and realised I still have a lot to learn. Unfortunately, I couldn't quite work out how to create a chart looking like the one in my (hastily sketched) image, and I couldn't extract the useful information from PGFPlots manual without getting totally lost.
The chart (graph?) I want to make should be of distinct categories on the x axis, with lines representing ranges of values on the y. I feel certain this is simple but just can't seem to get a handle on it.
Any guidance would be so greatly appreciated.