Colour–magnitude diagram vs. M_r for galaxies in the cluster A2142. The red filled circles correspond to the galaxies with old stellar populations (D_n (4000) ≥ 1.55) and the blue filled circles to the galaxies having young stellar populations with D_n (4000) < 1.55. The green triangles show recently quenched galaxies with D_n(4000) ≤ 1.55 and star formation rate log SFR < −0.5. The red triangles indicate red, high SFR galaxies defined as g − r ≥ 0.7, and log SFR ≥ −0.5. The dashed line shows the completeness limit M_r = −19.6 + 5 log₁₀h.