Lighcurves of Int-SIM (red, 200 − 1630 nm), Int-SATIRE (blue, 200 − 1630 nm) and SORCE/TIM (green) for (top) original data and (bottom) smoothed or long-term data. Int-SIM and Int-SATIRE have a constant shift, given in Table 2, added to bring them in line with TIM. Note that the y-axes are on different scales: the bottom panel displays the smoothed lightcurves from the top panel, with a scale of 3 W m-2, with a reduced irradiance scale of 1 W m-2. Error bars represent one standard deviation in the long-term stability of Int-SIM and are 0.259 W m-2 or 212 ppm. The vertical dotted line represents the time of solar minimum, December 2008.
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