Table 1: Log of the Cygnus X-1 observations analyzed in this paper.
Epoch    Instrument Observation Period  Exposure Observation
    (date yy/mm/dd)     (ks)     Type
             IBIS 02/11/25-02/12/15      810 staring, 5$~\times~$5a, hexb
    1 IBIS/SPI/JEM-X 02/12/09-02/12/11 365/365/31     5$~\times~$5
    2 IBIS/SPI/JEM-X 03/06/07-03/06/11 292/296/275     5$~\times~$5
    3   IBIS/JEM-X 03/03/24-04/09/10   269/35     GPSc
    4 IBIS/SPI/JEM-X       04/11/22    8/8/6 calibration
Notes:
a 5$\times$5 dither pattern around the nominal target location.
b Hexagonal pattern around the nominal target location.
c Individual exposures separated by 6° along the scan path, shifted by 27.5° in galactic longitude.
(Observations indicated on the first line also used, together with epochs 1-4, for Figs. 2 and 3.)

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