[Fe/H] vs. [Si/Fe] diagrams for stars in different temperature bins. Contours show the density of stars in GALAH DR4 table (blue) and in the detrended table produced in this work (ornage). Stars outside the lowest contour are plotted as points. The grey line shows the general shape of the diagram, so it is easier to compare the positions and shapes of the contours in each panel. Only stars with flag_sp< 4 and with no flags in Iron or Silicon abundances are plotted.