Top panel: modulus of the angular power spectra of the different signals contributing to galaxy position-shape correlations. Number density-intrinsic correlations (gI) are shown in black, galaxy-galaxy lensing (gG) in red, magnification-shear correlations (mG) in green, and magnification-intrinsic correlations (mI) in blue. Solid curves correspond to the redshift auto-correlations at z = 0.5, i.e. close to the mean redshift of the low-redshift MegaZ-LRG sample, and dotted curves to the mean redshift of the high-redshift sample at z = 0.59. Bottom panel: ratio of the aforementioned signals over the gI correlations, with the same coding of the curves as above. The grey region covers angular scales that do not contribute significantly to the correlation functions. Galaxy-galaxy lensing and possibly mG correlations yield a relevant contribution to number density-shape correlations besides the gI signal.