The channels should be {HEAD ~ 2 3 times the side length} of the resistor to provide {TAIL ~ an adequate gap} between them 
The channels should be { HEAD ~ 2 3 times the side length } of the resistor to provide { TAIL ~ an adequate gap } between them
OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH