Fig. 8.
Upper panel: identification chart for GR290. Dashed-dotted line shows the slit position during July observations. Lower panel: tracing of the two-dimensional spectral image obtained of GR 290 in July 2017 along the spatial direction centred on the Hα emission line. GR 290 is located at zero point and has a strong and sharply-peaked Hα line with asymmetrically extended wings.
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