Here are some plots of clusters on each disk for run number 13186003 and 13173068. 

Both runs were taken with the same high voltage settings. Run 13186003 had beam off, and run 13173068 had beam on. 

Here is the code used to set the cluster parameters:

a2cMkr->setFgtDb(fgtDbMkr->getDbTables());

a2cMkr->setAbsThres(-5000);

a2cMkr->setRelThres(4.);

a2cMkr->doCutBadStatus();

a2cMkr->acceptLongPulses(true);

a2cMkr->setClusterThreshold(0.8);

Char_t *myMaker = "StFgtClusterMaker";

if(gClassTable->GetID(myMaker)<0) {

gSystem->Load(myMaker);

}

StFgtClusterMaker* myMk=new StFgtClusterMaker("FgtClustMaker");

seededClusAlgo = new StFgtSeededClusterAlgo();

seededClusAlgo->setJumpSingleStrip(true);

myMk->setClusterAlgo( seededClusAlgo );

cout <<"1" <<endl;

fgtAVEffMkr = newStFgtGenAVEMaker ( "avEffMkr");

fgtAVEffMkr->SetEffDisk(effDisk);