Based on observations with INTEGRAL, an ESA project with instruments and science data centre funded by ESA member states (especially the PI countries: Denmark, France, Germany, Italy, Switzerland, Spain), Czech Republic and Poland, and with the participation of Russia and the USA.

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Table 1 is only available in electronic form at http://www.edpsciences.org

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...1,2,3,

Present address: Centre d'Étude Spatiale des Rayonnements, 9 avenue Colonel Roche, BP 4346, 31028 Toulouse Cedex 4, France.

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... GASPAN

The software, developed by F. Riess, and documentation are available under http://ftp.leo.org/download/ pub/science/physics/software/gaspan/

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... CESR

http://sigma-2.cesr.fr/spi/download/spi_intrumental_lines/

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... events

In 1.4-1.6 MeV only single detector events that also triggered the PSD electronics have been used to avoid electronic noise; the count rates were corrected for the efficiency of the PSD electronics which at these energies is about 85% (see Roques et al. 2003).

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... Laboratory

http://www.nndc.bnl.gov/

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... energy

ECs outside the detectors contribute as well.

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