UM) where NUM is a column vector of times, returns the 
    mean interval between sample times DT.
 
    [DT,SIGDT,MEDDT,MAXDT]=<a href="sampletimes.html">SAMPLETIMES</a>(NUM) also returns the standard 
    deviation of sample intervals SIGDT, the median sample interval MEDDT,
    and the maximum sample interval MAXDT.
 
    IF NUM is a cell array of numerical arrays, the output of SAMPLETIMES
    will be arrays of size LENGTH(NUM) x 1.
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