“…The mean absolute differences between the KSO and DPD positions are lower in all cases -except for the longitude difference for complex sunspot groups -than the mean absolute difference between the KSO and GPR positions. As the KSO and GPR comparison was made for the year 1972, it may be possible that the KSO data is influenced by the er- , 1874, -1976, Table 3, row 1 GPR, 1879-1975, Javaraiah (2003, Table 3, row 3 GPR , 1940-1968, Balthasar & Wöhl (1980, Table 3, row 6 EGR, 1878 -2011, Sudar et al (2014), Table 3, row 8 EGR , 1976, -2002, , Javaraiah (2003, Table 3, row 9 EGR, 1874 -1996, Pulkkinen & Tuominen (1998), Table 3, row 10 Mt. Wilson, 1921-1982, Table 3, row 15 DPD , 1974, , Sudar et al (2017, Table 3, row 16 KSO, 1947-1981, Lustig (1983, Table 3, row 18 KSO, 1964 Table 3, row 20 KSO, 1964 Table 3).…”