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