In exemplary embodiments, the capillary channel may be formed in the substrate or may be {HEAD ~ a capillary tube} embedded in {TAIL ~ the substrate} 
embedded in
In exemplary embodiments , the capillary channel may be formed in the substrate or may be { HEAD ~ a capillary tube } embedded in { TAIL ~ the substrate }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL REL TAIL TAIL TAIL TAIL TAIL TAIL