I’m looking to add a marker to designate a specific time of day. So say for example a plot has an x-axis with datetime between Datetime1 to Datetime2. Looking to add a marker at 3AM and 3 PM. I was not sure if this would be good to do with a custom ticker, although I already have 2 x-axis. The other though I had was to use a label, at those times, but was not sure how best to add a label to every 3AM and 3PM. Any thoughts on how to do this cleanly?