[Ca/Fe], [Mg/Fe], and [Si/Fe] as a function of [Fe/H] for the 51 stars of Liller 1 measured so far. The values obtained from different surveys at high and medium spectral resolution are shown with different symbols. The red squares represent the 12 stars observed with CRIRES+ that we presented in this paper, the yellow triangles show the NIRSPEC sample (F24), and the green circles show the X-shooter sample (Alvarez Garay et al. 2024a). For reference, the dashed vertical and horizontal lines mark the solar values.