cleansing up lousy ticks (when you see a nasty tick it's possible you'll try forcing backfill in hope that data vendor has cleaned up its database and you'll get fastened data - works nicely for eSignal that actually seems to repair lousy ticks after they happen) You could question: https://amibroker-data-feed32086.blogsuperapp.com/28486285/the-greatest-guide-to-amibroker-data-feed