Gord,
As per my reply to OP, if this data is/was generated by a data logger
then the frequency will be consistent for the runtime of the logging
session.

contrucci,
Gord's formula will most likely not encounter an error unless the end
data was cut short of a full cycle. If this happens then simply discard
the errant data. (This would be 5 or less rows at this output
frequency)

--
Garry

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