cleansing up negative ticks (whenever you see a nasty tick you could test forcing backfill in hope that data vendor has cleaned up its database and you'll get mounted data - works properly for eSignal that basically appears to fix terrible ticks when they take place) SHUT (purple gentle) https://dataforamibroker20852.tkzblog.com/27872886/the-greatest-guide-to-amibroker-data