I am displaying a daily data feed in my app, i.e. one value per day. The data is displayed in either a bar or line chart. In the event that a data point is missing on a given day, I want to indicate somehow that the value is missing on that day. Here are a couple initial design concepts that are quite visually distracting or strong. I'm aiming for a design that is less distracting, more elegant.
(If my wording of the question is not specific enough, please leave comments and I'll improve it.)