Top: (Left) excess map of events observed in the direction of PG 1553+113 using the H.E.S.S. II mono analysis (16.8 h live time). The source position is indicated by a black dot. Right: significance distribution that corresponds to the excess map. The meaning of the histograms and statistics data is the same as in Fig. 1. Bottom: θ² distribution for PG 1553+113. The meaning of the data shown is the same as in Fig. 1. The vertical dashed line shows the limit of the on-source region. The energy threshold for this analysis is ≈100 GeV.