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Coherency interpolation at different points in time for the 144 nm channel of SORCE SOLSTICE A, which contains 65 channels in total (115 nm–179 nm). Each color represents a reconstruction of the 144 nm channel using a sequence of datasets of which some contain gaps for the days marked by a black horizontal line that were filled using the SVD interpolation. We show the original data (solid thick black), interpolated data where only this channel has been removed and re-interpolated (long-short dashed, blue), data where not only the 144 nm channel has been removed, but also its lower and upper 10 channels, i.e. everything from 134 nm to 154 nm (short-dashed green), and data where everything but the outermost channels (the two channels at 115 nm and 179 nm) have been removed for the selected days (long-dashed red). We also show our estimated precision (dotted black). The lower plot displays the error introduced by the SVD interpolation, smoothed over four days for better visibility. Due to the high spectral coherency, the error in the reconstruction is not significantly affected when removing not only the neighboring two, but 21 channels. Removing all but two channels does increase the error up to 100%, yet most data are still below our own estimation of the precision.
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