CME_MINI:ES1!   S&P 500 E-mini Futures
Single prints, including tails, are frequently seen at the top and the bottom of the profile. They are formed by price moving quickly away and require at least two TPOs to be confirmed.

A buying tail occurs at the bottom of the range.
A selling tail occurs at the top of the range.
Tails occurring in the last period of the session are called spikes because they cannot be confirmed by a following time period.
Sometimes single prints are seen separating distributions within a Profile, often either as a double-distribution day or on a trending day.

Note – Single prints on extremes (tails) are important auction terms; they frequently mark the end of one auction and the beginning of another.

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