Surface density map of the southern half of the main body of Sgr dSph as traced by M giants from 2MASS (Skrutskie et al. 2006), selected according to Majewski et al. (2003). The light-shaded areas have E(B−V) > 0.3 according to the extinction maps by Schlegel et al. (1998). The globular clusters associated to Sgr dSph are marked and labelled. The dashed ellipse is the half-light contour of the best-fit King (1962) model by Majewski et al. (2003); the half-light radius along the major axis is taken from McConnachie (2012). For b ≥ −13.0° the contamination by foreground Galactic M-giants and the high extinction prevent a reliable tracing of the Sgr density, affecting the shape of the outer iso-density contours. At the distance of Sgr dSph (D = 26.3 kpc, Monaco et al. 2004), one degree corresponds to 459 pc.