200 × 200 pixel (101 × 101 arcsec) inset, near disc centre (μ > 0.93), encompassing active region NOAA 11494, of the simultaneously recorded 720 s data products examined, before (top) and after (bottom) image restoration with K₂. The grey scale is saturated at −1200 and 1200 ms^-1 for the Dopplergrams, at − 100 and 100G for the longitudinal magnetograms, and at 0.6 and 1.2 for the continuum and line-core intensity images. The Dopplergram was corrected for the velocity of SDO relative to the Sun and for differential rotation (Sect. 3.2.4). Both the continuum and line-core intensity images were normalized to the mean quiet-Sun level (Sect. 3.2.1). The red and blue contours in the grey scale plot of the uncorrected longitudinal magnetogram and continuum intensity image follow I/I₀ = (I/I₀)_QS,P, the quiet Sun to penumbra boundary. The colour coding is to distinguish the big sunspot feature (red) from the smaller sunspots and pores (blue), treated separately in Fig. 17.