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We provide first constraints on the morphology of the 511 keV line emissionfrom the galactic centre region on basis of data taken with the spectrometerSPI on the INTEGRAL gamma-ray observatory. The data suggest an azimuthallysymmetric galactic bulge component with FWHM of ~9 deg with a 2 sigmauncertainty range covering 6-18 deg. The 511 keV line flux in the bulgecomponent amounts to (9.9+4.7-2.1) 10e-4 ph cm-2 s-1. No evidence for agalactic disk component has been found so far; upper 2 sigma flux limits in therange (1.4-3.4) 10e-3 ph cm-2 s-1 have been obtained that depend on the assumeddisk morphology. These limits correspond to lower limits on the bulge-to-diskratio of 0.3-0.6.Comment: 5 pages, 3 figures, accepted for publication in A&

Early SPI/INTEGRAL constraints on the morphology of the 511 keV line emission in the 4th galactic quadrant