The app tracks heart rate continuously from my Galaxy Fit watch. As part of that function, a bar graph indicates a different heart rate range each time it syncs with my watch. Once a day, there will be a blue dot at the bottom of one of the bars, and I don't know what it's indicating. I have determined that the time of day is not consistent, nor does it seem to indicate lowest heart rate of the day. Does anyone know what this blue dot is?