I am using
revtex4-1 for a Physical Review Letter. Typically when a figure is made, the caption starts out
FIG. 1. <text>. I am creating a supplementary file and I would like it to say
FIG. S1. <text>. How can I change that?
A global modification to
would suffice (in your document preamble). Alternatively, if you only want to modify the figure number representation in the caption only (since you might not be referencing it as part of "supplementary figures"), you could use
The former is preferred, since it makes more sense.