Fig. 3
Top row: duration of habitability (transit) as a function of the distance from the host star, for different masses M and chemical compositions of the host star for a fixed value of ΔY/ ΔZ = 2 and two metallicities Z = 0.005 and Z = 0.040. Bottom: same as the top row, but for a fixed metallicity Z = 0.040 and two values of ΔY/ ΔZ, namely 1 (left panel) and 3 (right panel).
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