The Display Line ("DL") level is the no-loss reference level of -1.70dBm. The marker level after the filter has been inserted is -2.50dBm. Therefore insertion loss looks like 0.8dB. The corners look like 5.7GHz and 5.9GHz, roughly. Which means 200MHz of bandwidth. Kind of divergent from the specifications DS_BPF5800A.PDF. The skirts look like they fall 30dB/200MHz.