GET

        LAS\GET [N [version]|FIRST|LAST|NEXT|PREVIOUS|ZERO]

    GET copies R into T, and loads the Observation number N in R.  The  cur-
    rent  index  initialized by FIND is first explored, then, if needed, the
    whole input file. If N is absent, the previous (last  read)  Observation
    is recovered.

    Instead of an observation number, several keywords can also be used:
      - FIRST:    the first Observation of the current index is loaded,
      - LAST:     the last Observation of the current index is loaded,
      - NEXT:     the next Observation in the current index is loaded,
      - PREVIOUS: the previous Observation in the current index is loaded,
      - ZERO:     the  internal  Observation  counter is reset to 0, so that
                  next GET NEXT will get  the  first  observation.  In  this
                  unique case, R and T are not modified.