def getValuesInInterval(dataTupleList, start, stop):
    """
    Gets the values that exist within an interval
    
    The function assumes that the data is formated as
    [(t1, v1a, v1b, ...), (t2, v2a, v2b, ...)]
    """
    intervalDataList = []
    for dataTuple in dataTupleList:
        time = dataTuple[0]
        if start <= time and stop >= time:
            intervalDataList.append(dataTuple)
    return intervalDataList
