TEfficiency error bars too big

ROOT Version: 6.18/00
Platform: Red Hat 8.5.0-16
Compiler: gcc version 8.5.0

Hello experts,
I have a question regarding the TEfficiency plots. I am creating the plots as

TEfficiency* pEff = new TEfficiency("eff","Seeding acceptance; pT [MeV/c]; Efficiency",30,0,105);
for (range) {
     if (A) {pEff->Fill(true, value);}
     if (B) {pEff->Fill(false, value);}

and I get this attached plot. Why am I getting the first two huge error bars? What do they stand for?

Thank you in advance!

Hi @arazquin; I am sure @moneta can help here.


I believe that this was occurring because there were not enough points for these values of pT.