Example of a rest-frame template (red curve) and observed spectrum (black curve) that mimic the StePS observation of a galaxy at z = 0.55 and S/N_I, obs = 10. The central rest-frame wavelengths of ultraviolet spectral indices are marked with blue solid lines, while those of optical spectral indices are marked with red solid lines. CN4170 and CN₂ features share similar positions (*) in the plot. Gray vertical bands represent gaps in the WEAVE spectrograph. It is worth noting that FeII2402, BL2538, and TiO2 indices are outside the considered spectral range, while BL3580 and Hβ features fall in the gap of the CCD at this particular redshift (dashed lines).