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