Comparison between EMD modes with similar timescales from different data. Panel a): intrinsic mode function (IMF) ψ₅ for Wolf sunspot number (WSN, magenta dashed) and group sunspot number (GSN, magenta full), IMF ψ₀ for sunspot numbers SNR04 (blue) and SNR14 (blue dot-dashed). Panel b): IMF ψ₆ for WSN (magenta dashed) and GSN (magenta full), IMF ψ₁ for SNR04 (blue) and SNR14 (blue dot-dashed). Panel c): IMF ψ₇ for WSN (magenta dashed) and GSN (magenta full), IMF ψ₂ for SNR04 (blue) and SNR14 (blue dot-dashed). For panels a) and b), the WSN and GSN IMFs are divided and multiplied by the same factor 5 and the SNR14 IMF is divided by 2; for panel c), the WSN IMF is divided by 2, the GSN IMF is multiplied by 8 and the SNR14 IMF is divided by 5.