Yearly averaged (6 September 2015–5 September 2016) line-of-sight magnetic field at latitude −21° (blue dots). The green-curves show the error estimate based on the scatter in the daily value going into the 12-month averaging. The red curve shows the fit Bl.o.s. = −Bϕsin(ϕ − ϕmeridian)+Bpolcos(ϕ − ϕmeridian), and the pink shaded region shows the 1-σ error estimates for the parameter fits.
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