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This set of spectroheliograms was taken by using
the BBSO Littrow Spectrograph system on 1998 September 19 near disk center.
The raster scan was made by drifting the telescope. The Dopplergrams is just the difference
between -0.5 and 0.5 A images, and the dark features represent blue-shifts
and the bright features, redshifts.
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This set was taken on 1998 September 20 near disk center.
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