Synthetic CSP spectra with ne normalised at λ₀ = 4020 Å and other spectrophotometric quantities computed with the ES code REBETIKO for an instantaneous burst SFH (TAU1) with the colour coding on the main panel representing the CSP age t. Smaller panels from left- to right-hand side and top to bottom display as a function of t, respectively: SFR Ψ(t) (blue line); mean stellar age ⟨log t_⋆⟩ weighted by light (blue line) and mass (red line); predicted total luminosity (full lines) and monochromatic luminosity at the continuum (dashed lines) of the Balmer emission lines Hα (red lines), Hβ (blue lines), Hγ (green lines) and Hδ (violet lines); flux at normalisation wavelength F_λ0 (red line); stellar metallicity ⟨Z_⋆⟩ weighted by light (blue line) and mass (dashed red line); selected Lick/IDS indices; total ever formed (blue line) and currently available (red line) stellar mass M_⋆; predicted EWs of the Balmer emission lines Hα (red line), Hβ (blue line), Hγ (green line) and Hδ (violet line); and photometric magnitudes for passbands of selected photometric systems.