Overview of the emergent (bolometric) intensity for a selection of stars, namely main-sequence (MS), turnoff (TO), K-giant and K-dwarf (from left to right, respectively) at a given time instant. For each star, we show four metallicities [Fe/H] = 0.0, − 1.0, − 2.0 and − 3.0 (from top to bottom, respectively). To facilitate comparisons between the different metallicity of each star, the intensity scale and the horizontal geometrical size of the metal-poor simulations are identical to [Fe/H] = 0.0, and the individual intensity contrasts [%] are indicated in each box.