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