series,Observation time seconds,Event-time frontier seconds
Source A,0,0
Source A,5,5
Source A,10,10
Source A,15,15
Source A,20,20
Source A,25,25
Source A,30,30
Source B,0,0
Source B,5,2
Source B,10,4
Source B,15,4
Source B,20,4
Source B,25,20
Source B,30,30
Safe combined minimum,0,0
Safe combined minimum,5,2
Safe combined minimum,10,4
Safe combined minimum,15,4
Safe combined minimum,20,4
Safe combined minimum,25,20
Safe combined minimum,30,30