Comparison of streamer belt extremal latitudes (at heliographic latitudes Λ_H = Λ_SB, where in each hemisphere the average value for east and west limbs is used) from eclipse images (pale blue dots), magnetograph observations (colour pixels) and modelling (blue line) based on sunspot numbers and flux continuity equations (Lockwood & Owens, 2014). The colored pixels give the annual means of the occurrence frequency (in %) of streamers (P_DS and P_SS are the occurrence probabilities of dipolar streamers and pseudostreamers, respectively) from Potential Field Source Surface modeling of the corona based on magnetograms recorded the Wilcox Solar Observatory as a function of sin(Λ_H) and time.