X-axis lable change

[kacperzdzieborski]

I'm doing my dissertation. I have a graph that is the Bending Moment along a tube. Y-axis is the BM, and X-axis is the position of its values along the tube (numbers in mm). What I would like to display on the X-axis is 3 words, Front, Middle, and Back. To tell which side of the tube is where. How does one do it? 

Just like in the picture below. 

Thanks for any help. 

[#2 · Accepted solution]

@kacperzdzieborski Perhaps like in the attached file?

[#3]

@Riny_van_Eekelen Yes, exactly, thank you for your help.