When this point is reached, the laser energy is stopped and a cool fluid is immediately applied to the ablation site to create additional thermal stresses, resulting in {HEAD ~ further ablation} of tissue by {TAIL ~ the thermal expansion stress} of rapid cooling 
by
When this point is reached , the laser energy is stopped and a cool fluid is immediately applied to the ablation site to create additional thermal stresses , resulting in { HEAD ~ further ablation } of tissue by { TAIL ~ the thermal expansion stress } of rapid cooling
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH