Lag-frequency spectrum (top) and coherence spectrum (bottom) of several bands of interest for r = 10^15.75 cm. The labels are (from top to bottom) unabsorbed band RGS (26−27 Å) vs. broadband EPIC-pn (1.5−10 keV), soft band (0.3−1 keV) vs. hard band (2−5 keV) both from EPIC-pn, Ne blended absorption in the RGS band (12.5−14 Å) vs. broadband EPIC-pn (1.5−10 keV), and Fe UTA absorption feature in the RGS band (15−17 Å) vs. broadband EPIC-pn (1.5−10 keV). A negative lag indicates that the band of interest lags the reference band.