Upper panel: sunspot numbers from 16 individual stations in the R_i-Network (thin lines) and from the Locarno station (thick black line) compared with the F_10.7 flux (thick dashed line) transformed according to the R₂ monthly relation (Johnson 2011) (F_10.7 = 67 sfu). The station codes are listed in the legend. Lower panel: comparison between the R_i index (thick black) and 9 other independent sunspot networks (moving averages over one year). Abbreviations from the legend can be found on the SONNE website (http://www.vds-sonne.de/index.php?page=gem/res/results.html).