a gap is a trade which trades outside of the previous days range up or down. Doesn't matter if the open was different then the previous close. Just so long as the trade the previous day also had a trade which covered that close. If the trade on the 6th was at .004 and the next day opened ,0045 and had a pull back to .004 then the gap was filled. IF the day of the close had a trade at .0045 and closed .0039 and next day opened at .0045 and never pulled back there was no gap. On pennies it sometime is hard to get actual numbers after a few days.
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