the indicator will plot all m15 m30 h1 h4 d1 etc.... candle opening times (an opening after previous opening would mean that the candle/bar which happened before is now closed). It would especially be amazing if the the vertical lines would have a small text at the bottom stating their time frame like - m30 for example. (Such can be seen on one of the sessions indicator). Now of course it doesn`t have to be rigid just for standard time frame.