Time of the bar that ended it, or null while it still extends.
Price span, from the outer edge of its lowest row to the outer edge of its highest.
Time of the bar the zone starts after.
Time of the first bar after it became active whose high to low range reached it, which is when an alert fires (since 2.6.4), or null. A bar that jumps across the zone reaches it too, as it would trigger a stop there.
Time of the bar that made it active for alerts, or null.