Detector patterns for different types of background lines. The average of the first part of the mission with all 19 detectors working (“epoch 1”) is plotted as horizontal red lines, and for each orbit within this epoch values per orbit are plotted around this epoch-average value, using this as a time axis within the epoch. Above: line at 1764 keV from 205Bi. Middle: line at 872 keV from 69Ge. Bottom: positron annihilation line at 511 keV, of mixed origins. For this, also shown is the situation where detector No. 2 had failed (“epoch 2”; blue horizontal lines for epoch-average value, values per orbit superimposed onto this and in grey).
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