Fig. 12

SV candidate model. a Secular variation of the Gauss coefficients and b their uncertainties given by the 1-σ of their normal distributions. c Secular variation of the Gauss coefficient differences between our SV candidate and the published SV-2020-2025 model. d Secular variation of the power spectrum at the Earth’s surface (blue line referred to the left y-axis) and at the CMB (red line referred to the right y-axis). Differences of the secular variation of the power spectrum between our candidate and the SV-2020-2025 model is also given by dashed lines (blue at Earth’s surface and red at CMB)