a data processing means connected to the source, the plurality of power control means and the temperature sensing means for controlling the amount of {HEAD ~ heating} in {TAIL ~ accordance} with a desired heating pattern 
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a data processing means connected to the source , the plurality of power control means and the temperature sensing means for controlling the amount of { HEAD ~ heating } in { TAIL ~ accordance } with a desired heating pattern
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH