{HEAD ~ The preconcentrator} may also include {TAIL ~ a resistor} and a proportional integral differential controller 
include
{ HEAD ~ The preconcentrator } may also include { TAIL ~ a resistor } and a proportional integral differential controller
HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH