Notes. The first column specifies the ESO period in which the observations were collected. The second column gives the date and hour of the start of observations (UT), which is also reported in MJD format in the third column. The fourth column gives the exposure time in seconds. The fifth column reports the OB grade, given by ESO on a set of constraints on observing parameters (image quality, airmass, sky transparency, fractional moon illumination, moon distance, precipitable water vapour, twilight allowance): ‘A’ means that all constraints are fulfilled; ‘B’ and ‘C’ mean that at least one constraint is exceeded by less than 10% or more than 10%, respectively. The sixth and seventh columns report the seeing and airmass, respectively, as quoted from the FITS files’ headers. Upon inspection, grade B and C observations did not show a decrease in the achieved S/N. Exceptionally, we consider them for our purposes since we do not expect any strong systematic influence on the final results at our level of S/N. In the future, only grade A observations will be considered.