About every 6 months, the SPI instrument goes through a so-called
``annealing'' phase. During these phases, the detectors are heated up
to about 100C for a few days so that their crystal structure can
re-arrange and correct itself for most of the accumulated radiation
damages. During these phases, listed in Table ![[*]](crossref.png)
, SPI
does not produce any scientific data. At the end of an annealing
phase, the detectors are cooled down again and they are switched on
before the temperature reached the nominal value. During this period,
the standard energy correction is not so good and special care has to
be taken for accurate spectral analysis. These periods with unstable
temperature are included in the ranges of revolution provided in
Table . Data from revolutions outside of these ranges
should be fine in this respect.
| UT | IJD | Revolutions included | |
| start - stop | start - stop | first - last | |
| 1 | 2003-02-06 09:00h - 2003-02-18 00:00h | 1132 - 1144 | 39 - 42 |
| 2 | 2003-07-15 12:00h - 2003-07-29 18:00h | 1291 - 1306 | 92 - 96 |
| 3 | 2003-11-11 12:00h - 2003-11-26 20:00h | 1411 - 1426 | 132 - 136 |
| 4 | 2004-06-17 09:00h - 2004-07-02 18:00h | 1629 - 1645 | 205 - 209 |
| 5 | 2005-01-19 09:00h - 2005-02-05 06:00h | 1845 - 1862 | 277 - 282 |
| 6 | 2005-06-14 00:00h - 2005-06-30 00:00h | 1991 - 2008 | 326 - 330 |
| 7 | 2006-01-09 00:00h - 2006-01-26 00:00h | 2200 - 2217 | 395 - 400 |
| 8 | 2006-06-08 00:00h - 2006-06-27 00:00h | 2350 - 2369 | 446 - 452 |
| 9 | 2006-12-04 10:00h - 2006-12-22 15:00h | 2529 - 2547 | 506 - 511 |
| 10 | 2007-05-29 12:00h - 2007-06-17 17:00h | 2705 - 2724 | 565 - 571 |
| 11 | 2008-01-12 04:00h - 2008-01-31 07:00h | 2933 - 2952 | 641 - 647 |
| 12 | 2008-08-17 04:00h - 2008-09-05 19:00h | 3151 - 3171 | 714 - 720 |
| 13 | 2009-04-20 08:00h - 2009-05-11 23:00h | 3397 - 3418 | 796 - 802 |
| 14 | 2009-10-19 18:00h - 2009-11-09 09:00h | 3579 - 3600 | 857 - 863 |
| 15 | 2010-03-30 09:00h - 2010-04-17 01:00h | 3741 - 3759 | 911 - 916 |
| 16 | 2010-10-10 11:00h - 2010-10-31 01:00h | 3935 - 3056 | 974 - 982 |
| 17 | 2011-04-25 23:00h - 2011-05-16 21:00h | 4132 - 4153 | 1041 - 1048 |
| 18 | 2011-11-21 08:00h - 2011-12-12 07:00h | 4342 - 4363 | 1111 - 1119 |
| 19 | 2012-06-05 17:00h - 2012-06-26 20:00h | 4539 - 4560 | 1177 - 1184 |
| 20 | 2013-01-04 01:00h - 2013-01-22 09:00h | 4752 - 4770 | 1249 - 1254 |
| 21 | 2013-08-01 10:00h - 2013-08-19 18:00h | 4961 - 4979 | 1319 - 1324 |
| 22 | 2014-01-06 23:00h - 2014-01-25 08:00h | 5119 - 5138 | 1372 - 1377 |
| 23 | 2014-08-28 07:00h - 2014-09-12 15:00h | 5353 - 5368 | 1450 - 1454 |
| 24 | 2015-02-15 13:00h - 2015-02-28 09:00h | 5524 - 5537 | 1508 - 1512 |
| 25 | 2015-09-08 09:00h - 2015-09-23 19:00h | 5729 - 5745 | 1585 - 1590 |
| 26 | 2016-03-04 11:00h - 2016-03-17 06:00h | 5907 - 5920 | 1652 - 1656 |
| 27 | 2016-07-23 11:00h - 2016-08-07 21:00h | 6048 - 6064 | 1705 - 1710 |
| 28 | 2017-01-14 23:00h - 2017-01-30 09:00h | 6223 - 6239 | 1771 - 1776 |
| 29 | 2017-07-25 09:00h - 2017-08-09 19:00h | 6415 - 6431 | 1843 - 1848 |
| 30 | 2018-01-27 14:00h - 2018-02-11 23:00h | 6601 - 6617 | 1913 - 1918 |
| 31 | 2018-07-22 00:00h - 2018-08-06 12:00h | 6776 - 6792 | 1979 - 1984 |
| 32 | 2019-01-21 13:30h - 2019-02-06 00:00h | 6960 - 6976 | 2048 - 2053 |
| 33 | 2019-09-23 01:40h - 2019-10-08 14:30h | 7207 - 7220 | 2140 - 2145 |
| 34 | 2020-03-05 22:00h - 2020-03-21 11:00h | 7369 - 7386 | 2202 - 2207 |
| 35 | 2020-09-05 10:00h - 2020-09-21 00:00h | 7553 - 7569 | 2271 - 2276 |