cleansing up negative ticks (when you see a foul tick you could attempt forcing backfill in hope that data seller has cleaned up its database and you'll get fixed data - is effective properly for eSignal that really seems to fix undesirable ticks after they transpire) + IDEALPRO now https://amibrokerdatafeed56665.azzablog.com/28086522/5-essential-elements-for-amibroker-data