For other approaches to expressing uncertainty using intervals, see interval estimation. All these intervals span four semitones. There is no correlation between the lengths of polarity intervals. This results in a spectrum with points separated by equal frequency intervals. They reappear at referent locations at irregular time intervals. A timer is a specialized type of clock used for measuring specific time intervals. Males also copulate at shorter intervals than females. Rounds were three minutes with one-minute rest intervals between rounds. It is available in surveys that measure time intervals. Several methods exist for approximate integration over unbounded intervals. Variants associated with prolonged QT intervals decrease this current. Commas are very small intervals that result from minute differences between pairs of just intervals. Molaison was able to remember information over short intervals of time. Instead, it may stretch across two of the intervals determined by . Related sequences contain divisions approximating other just intervals.