Stitching correction performed by YARARA on the five years of HD 128621 data for the 6200 Å stellar line described in Dumusque et al. (2015). The time dimension is phase-folded at 1 year. Top left: spectral time series before YARARA corrections. The position of the stitching is indicated by the black curve and is used to mark the delimitation of the step function used for correction (see text). Bottom left: same as top left but after YARARA processing. Top right: LBL RV of the line crossing the stitching. Colour encodes the unfolded time. Bottom right: same as top right but after YARARA processing. The RV rms has been reduced from 19.4 m s⁻¹ down to 6.6 m s⁻¹. The LBL morphological correction (see Sect. 2.11) mitigates the rms even further, down to 5.6 m s⁻¹.