I have the following caption title:
Fig. 5. Measured small-signal gain, input return loss, and output return loss vs. frequency of C-band HPA.
This is equivalent to (a), (b), and (c) vs. (d)
Ambiguity lies in the above as to whether (a), (b), and (c) are all versus (d) or whether it is simply a list of three things. Pleas help with the correct use of punctuation to illustrate the former case.