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Left panel: in black, the difference between the simulated channels 3 and 4; in green, the simulated contribution to the channel 3 signal from wavelengths shorter than 19 nm. In blue, the simulated contribution for wavelengths longer than 19 nm. The start date for the use of the EVE data is indicated by the dotted vertical line. Note that there is the same contribution to channel 3 from wavelengths shorter than 19 nm as from wavelengths longer than 19 nm to channel 3. Right panel: the degradation of channel 3 response above 19 nm based on channel 4 (black) and TIMED/SEE and SDO/EVE (red, see text for explanations). The green line shows the current estimate of the degradation.
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