Well, this is awkward. I seem to have forgotten what star has a 0.0 value in the V-I color index. I almost want to say Vega but that's the 0.0 in the B-V color index. I also seem unable to find raw data for the V-I color index values for spiral galaxies and was wondering if someone would be willing to assist. If you have any questions, feel free to post. I also wanted to start a conversation in posting.