However, the apparatus described above is not provided with a device for controlling {HEAD ~ both the temperature} of {TAIL ~ the filter} and the concentration of the nitrogen dioxide in the filter to optimum values 
of
However , the apparatus described above is not provided with a device for controlling { HEAD ~ both the temperature } of { TAIL ~ the filter } and the concentration of the nitrogen dioxide in the filter to optimum values
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH