Table 6: Spectral fit of absorption edge(s). $\tau $ is the optical depth. Significant detections ($\geq $99$\%$) are marked in bold face.
Object $\tau_{\rm O VII}$ $\tau_{\rm O VIII}$ Detection Edge parameters Detection
  (E=0.74 keV) (E=0.87 keV)   E (keV) $\tau $  
I Zw1 0.11 $\pm$ 0.04 <0.01 99.9$\%$ 0.65 $\pm$ 0.02 0.21 $\pm$ 0.04 >99.99$\%$
PG 0804+761 <0.09 0.07 $\pm$ 0.06 90.3$\%$ 0.62 $\pm$ 0.04 0.16 $\pm$ 0.09 99.2$\%$
        0.95 $\pm$ 0.05 0.13 $\pm$ 0.06  
PG 0947+396 <0.10 0.15 $\pm$ 0.08 99.8$\%$ 0.85 $\pm$ 0.04 0.16 $\pm$ 0.08 99.9$\%$
PG 1114+445 2.26 +0.22-0.19 0.32 $\pm$ 0.16 >99.99$\%$ 0.72 $\pm$ 0.01 2.23 $\pm$ 0.17 >99.99$\%$
        0.93 $\pm$ 0.03 0.53 $\pm$ 0.13  
PG 1115+407 <0.19 0.08 $\pm$ 0.06 91.8$\%$ 0.78 $\pm$ 0.05 0.15 $\pm$ 0.08 99.4$\%$
        1.18 $\pm$ 0.10 0.15 $\pm$ 0.07  
PG 1116+215 <0.19 0.09 $\pm$ 0.07 97.7$\%$      
PG 1202+281 0.09 $\pm$ 0.07 <0.13 99.9$\%$ 0.80 $\pm$ 0.05 0.13 $\pm$ 0.07 99.92$\%$
PG 1307+085 0.33 +0.20-0.16 <0.44 99.97$\%$ 0.78 $\pm$ 0.04 0.39 $\pm$ 0.16 99.97$\%$
PG 1309+355 0.46 +0.20-0.15 <0.25 99.98$\%$ 0.75 $\pm$ 0.03 0.49 $\pm$ 0.17 99.97$\%$
PG 1352+183 0.11 $\pm$ 0.08 <0.08 97.0$\%$ 0.72 $\pm$ 0.06 0.12 $\pm$ 0.08 99.7$\%$
Mrk 876 <0.23 0.25 $\pm$ 0.12 99.92$\%$ 0.93 $\pm$ 0.05 0.26 $\pm$ 0.11 99.97$\%$


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