by a start time and an end time. if you only wish to get gap close signals during the morning you can, for example, enter 0900 and 1200.
a buy signal appears after a gap down has been closed. a gap down is indicated by a green background in the chart. the closing of the gap is indicated by a grey background. a short sell signal appears when a gap up has been closed. a gap up is indicated by a red background in the chart. the closing of the gap is indicated by a grey background.
a signal is only valid until the end of the day or until a new 