The improvement, as defined as {HEAD ~ the difference} between the performance at the trial solution and the best solution found by {TAIL ~ VRO} so far, is checked at 128 
The improvement , as defined as { HEAD ~ the difference } between the performance at the trial solution and the best solution found by { TAIL ~ VRO } so far , is checked at 128
OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH