I am looking for the correct way to write the caption name of figures in the response letter for a submission to an Elsevier journal. In the manuscript, the name is
Fig. 1. This is caption
I need add some figures in the response letter as well as revised manuscript. The figure number of these files will be different. So, if I refer to "Fig. 1" in the letter, the reviewer will not know which one I am referring to, the Fig. 1 in the manuscript or the Fig. 1 in the letter.
I am not sure about using
Fig. L-1. This is caption
Fig. L. 1. This is caption
to label figures in the response letter, or any solution...