Table 1: Observational parameters.
Time of Na D session UT start  8:18    end  10:33
Time of selected scans UT first  8:27    last  10:25
Central wavelength nm 589.0  (Na D2)
Scan range pm -49.9 to +30.8
Scan steps pm 0.89
Number of steps /scan   92
(=number of frames)    
Spectral resolution ( FWHM) pm 2
Frame exposure time ms 200
Scan cadence time s 32
Total number of scans   130
Number selected scans   22
Field of view arcsec 42
Image pixel size arcsec 0.09


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