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Table 2.

Background re-scaling times used in the performance check.

Scaling Orbits Pointings Days Hours
Const
at 140 at 5521 at 1435.42
at 214 at 10 251 at 1659.46
DetFail at 775 at 42 443 at 3337.50
at 930 at 52 239 at 3799.67
Anneal 60–70 1600–4500 170–210 4000–5000
30n 30 1450–2150 90 2160
20n 20 950–1450 60 1440
10n 10 400–800 30 720
5n 5 190–410 15 360
3n 3 110–250 9 216
2n 2 70–170 6 144
1n 1 50–90 3 52–72
24p 1/3 24 3/4–1 16–24
12p 1/6 12 3/8–1/2 8–12
6p 1/12 6 3/16–1/4 4–6
3p 1/24 3 3/32–1/8 2–3
2p 1/36 2 3/48–1/12 1–2
1p 1/72 1 3/96–1/16 0.5–1

Notes. The number of orbits, pointings, days, and hours are presented for the largest data set used, the 26Al-case with 92 867 pointings, comprising the full sky over 13.5 mission years. A Const background means that only one background parameter per component is used for the entire data set, i.e. the background variability is fixed. The 1p case allows for high variability as each observation pointing obtains its own background amplitude. The time nodes at which the four SPI detectors, 02, 17, 05, and 01 failed, are given in INTEGRAL Julian days (IJD) and are marked as DetFail. Intermediate background time scalings are chosen either inherent from the spectral background and response database (1n and Anneal) or from selected times in between.

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