Normalized monochromatic pulse profiles (top panel), PD (middle panel) and PA (bottom panel) as a function of the rotation phase of a slowly rotating NS with M = 1.5 M_⊙ and R = 12 km, and one (solid curves) or two antipodal (dashed curves) small bright spots on the surface. The radiation from the spots has angular and polarization distributions similar to those of a pure electron-scattering atmosphere. The computations were performed for inclination i = 60° and four different spot co-latitudes θ_sp= 15° (light blue curves), 45° (red curves), 63° (blue curves), and 90° (black curves). This figure is similar to Fig. 11 from Viironen & Poutanen (2004) who considered a NS rotating at 400 Hz.