{HEAD ~ Dressing solution}, such as {TAIL ~ DIW}, is supplied substantially at a single point on the center of the pad, at a first pressure  
such as
{ HEAD ~ Dressing solution } , such as { TAIL ~ DIW } , is supplied substantially at a single point on the center of the pad , at a first pressure
HEAD HEAD HEAD HEAD HEAD HEAD OTH REL REL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH