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Table 1 Temporal units

From: A comparison of methods for temporal analysis of aoristic crime

Notation Temporal unit
t start The earliest time at which an offence could
  have occurred.
t end The latest time at which an offence could
  have occurred.
t range The period of time between tstart and tend.
t mid The time halfway between tstart and tend.
t random A random time between tstart and tend.
t actual The actual time at which an offence occurred
  (usually derived from CCTV).
t known The actual time at which an offence occurred
  if that time was known at the
  time the crime was reported to police.
t estimate The estimated time (between tstart and tend)
  that the offence occurred, as calculated by
  the various estimation methods.