Fig. 20
Broad line region of the quasar PDS 456: the plot shows the normalized spectrum (blue) and differential phase (black) of the broad Paα line for the average of the UT1-UT4 and UT2-UT4 baselines (individual baselines in light gray). No differential phase signature is detected, neither in the individual baselines nor in their average, despite a precision of ≲1°.
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