Maser H2O versus [O IV] luminosity.Symbols and colors are as in Fig. 8. The dotted lines mark fixed ratios 10-4; 10-5; 10-6; 10-7 (from top to bottom). For comparison, the expected position of the z = 0.66 maser SDSSJ0804+3607 is marked with a black dot and a gray bar covering the range 0.1 × L [O III] < L [O IV] < 100 × L [O III] assumed from Fig. 6.
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