public function setInterpolationTableEntries(InterpolationTableEntryCollection $interpolationTableEntries)
    {
        if (count($interpolationTableEntries) > 0) {
            $this->interpolationTableEntries = $interpolationTableEntries;
        } else {
            $msg = "An InterpolationTable object must contain at least one InterpolationTableEntry object.";
            throw new InvalidArgumentException($msg);
        }
    }