Then, a second topographic image of the sample free of magnetic effects is produced from {HEAD ~ the amplitude} of the cantilever by {TAIL ~ slope detection} 
by
Then , a second topographic image of the sample free of magnetic effects is produced from { HEAD ~ the amplitude } of the cantilever by { TAIL ~ slope detection }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH REL TAIL TAIL TAIL TAIL TAIL TAIL