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