Star formation history of NGC 5044-UCD1 obtained using pPXF. The different grey-scale regions indicate the weight of each SSP model, which is equivalent to the zero-age mass distribution of the SFH. The dashed lines indicate the [Z/H] of each available model. The black filled circle depicts the luminosity-weighted SSP age and metallicity of this object as measured using absorption line strength indices (Sect. 3.3). The white pentagon shows the location of the mass-weighted age and metallicity derived from the full spectral fitting technique, and considering only models with [Z/H] < −0.25 dex.