Power vs. Wavelength X-Axis issue for 1 FBG

[ehmurray8]

Describe the bug
When only one FBG is being read from the power vs. wavelength x-axis is difficult to read.

To Reproduce
Run the program with a single FBG
Observe the Power vs. Wavelength graph

Expected behavior
The X-Axis is easy to read

Screenshots

[ehmurray8]

The program is not specifically designed, for working with only a single FBG. And this graph is mostly useful for seeing where different fbgs are in relation to one another. The solution is not apparent to me right now, and thus I am not going to spend time on fixing this issue with a very limited impact.