fs_usage, output display regarding io call - the options and flags shown

I am summarising output from fs_usage with a simple awk to total io calls, io time including wait (I believe): sudo fs_usage -f diskio | awk 'START{print "Times include async wait time"}{if(lasT>=$1){t=substr($0,110,8);ioc++;ioT+=t;appio[$NF" "$2]++;apIOT[$NF" "$2]+=t} else {if(ioc>last_ioc){print "\n"ioc" IOs\t∑s",ioT"\t"$1; for (x in appio){print appio[x]" \t"apIOT[x]" \t",x} ;n=0; ioc=0; ioT=0; split("",appio); split("",apIOT);last_ioc=ioc }}; lasT=$1}' & This gives a useful summary any second that there is physical IO but I have to guess what the [content] after call type is, here is a sample...

244 IOs	∑s 0.195188	12:26:18
1  	0.001309  	 cfprefsd WrData[AT1] 
1  	0.000293  	 corespotlighRdData[SNT3] 
5  	0.117798  	 corespotligh THROTTLED
173 0.063006  	 kernel_task WrMeta[AP]
20  0.005587  	 coreduetd RdData[AT1]
1   0.000214  	 corespotligh WrData[ANT3]
1  	0.00015  	 cfprefsd WrData[AP]
40  0.006412  	 coreduetd WrData[AT1]
2  	0.000419  	 corespotligh WrData[AT3]

Here are a few guesses, First A=async, S=Sync T = time-out set? 123 maybe secs for timeout P=privileged, physical? N=?? Can anyone confirm/correct these and maybe list others that might seen? I found a reference to the source code for fs_usage but it was a 404... I always assume sorting the keyed array output is too much trouble or impossible, am I missing a trick? I also do not get my START header information visible, why? For others that might find this info useful: where and how is THROTTLING implemented? Obviously io calls are completed more slowly... It seems odd not to discriminate Write [WTHROTTL] from Read [RTHROTTL].