Comparison of the SFHs of the HelmiC (in green) and HelmiA^* (in red) subsets with that of the local retrograde halo sample (black). Top: normalised star formation rate as a function of age. Bottom: cumulative metallicity distribution function (MDF). The SFHs in the upper panel have been normalised to their peak value. Note the slightly larger uncertainties for the HelmiA^* subset, which are due to its smaller size. For HelmiA^* (and the HelmiC-low met subset in the dashed green line), we restrict the comparison to the population with [Fe/H] ≤ − 1.0 (to remove the contamination by the disc).