Final mass fractions of the α-chain isotopes ( ⁵⁶Ni omitted) in the peak temperature–density plane for the exponential profile at Y _e = 0.5. The white colored space corresponds to values below the color scale shown. From left to right, the first row corresponds to ¹²C, ¹⁶O, and ²⁰Ne, the second row corresponds to ²⁴Mg, ²⁸Si, and ³²S, the third row corresponds to ³⁶Ar, ⁴⁰Ca, and ⁴⁴Ti, the fourth row corresponds to ⁴⁸Cr, ⁵²Fe, and ⁶⁰Zn, and the fifth row corresponds to ⁶⁴Ge, ⁶⁸Se, and ⁷²Kr.