In {TAIL ~ accordance} with the invention, {HEAD ~ discrete areas} of the screen are formed or treated so as to restrict drainage through those areas compared to the drainage through adjacent untreated areas 
In
In { TAIL ~ accordance } with the invention , { HEAD ~ discrete areas } of the screen are formed or treated so as to restrict drainage through those areas compared to the drainage through adjacent untreated areas
REL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH