Top panel: number of RV epochs obtained for each object. One Argus object, VFTS 1022, has been observed at 13 epochs and falls outside the plotted range. Middle panel: number of lines available for absolute RV measurements. Bottom panel: time elapsed between the first and last suitable epochs for RV measurement. The solid line corresponds to objects observed with Medusa while the dashed lines indicate objects observed with the Argus IFU.