Top: NFI filtergram (right-hand side of the CCD) scaled between −40 G and + 40 G with the red contours of the MDI magnetograms at | Bz MDI | = 5 G. The data are averaged over 4 h. Bottom: the light-gray crosses are the “ px to px” data. The dark dots are the binned data, fitted with a least-squares regression (red line). The fit parameters are defined as the slope β, the 1σ-uncertainty σBz and the correlation coefficient r.
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